50 Questions &
from Trcukee, CA asked:
October 10, 2017
My house is 40 years old; is there a standard width chimney cap?
There is no standard chimney cap. With masonry fireplaces, the construction is very much subject to builder discretion and the flue measurements will subsequently vary widely. With manufactured fireplaces, the chimney and chimney cap will be very specific to the fireplace.
on October 10, 2017
from MI asked:
August 12, 2017
Is it okay to overlap the pre-existing mesh with more protective covering in my situation? I'm having a hard time with bats entering my house. Everything is sealed except my chimney cap has 3/4 mesh. It is a natural gas set up.
We would not recommend overlapping the pre-existing mesh as this could result in too little air space available for the exhaust fumes to escape from your chimney. If you have a pre-fabricated chimney, we would suggest a louvered top replacement or changing to a cap with 5/8" mesh.
on August 14, 2017
from Lewisville, TX asked:
July 24, 2017
I am not entirely sure how I need to measure for the chimney cap. I have a rough estimate of 40' x 11' for the internal flute, which is flush with the chimney itself. Do I measure the inside or the entire chimney?
It would depend on how you would like the cap to mount. On a flue mounted cap, we would need the ID and OD of the flue itself.
from Pittsburgh, PA asked:
May 12, 2017
I have a wood burning fireplace and when temperature warms up outside or it rains, smell comes through wood burner. Do you make a chimney cap that spins and stops the air being pulled down?
There would not really be a cap design that would correct this issue with any assurance as the problems you are describing are the result of negative pressure. In the warmer months when customers turn on their home's HVAC for cooling, the fireplace's chimney will tend to draw in outside air as the return vent will pull floor level air up through the home's ventilation and push cool air out of the cooling registers near the ceiling. Since the pressure is not equalized, the force of a motorized blower fan will easily pull air down through the chimney, so I would recommend cracking a window to see if this is still happening once makeup air is being pulled from another location. If not, I recommend making sure the damper is in the fully closed position. If it is, consider installing doors to additionally restrict the amount of air that can be pulled through the fireplace opening.
To address the downdraft when it rains outside, these two things could be related to the subsequent wind that comes along with rain and the chimney not being tall enough to prevent downdraft. In order to correct this, please ensure the chimney is at least 3' above the roof and then an additional 2' over any obstruction measured within 10' horizontally from this point.
from Dallas, TX asked:
April 3, 2017
I have a chimney with outside dimensions of 64" x 27." Do you have anything to fit those dimensions?
While we will not have any stock caps that will mount on the outside of this chimney, most customers choose a product like our Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
to install on the chimney crown surface in between the outer perimeter of the chimney crown and flue tile(s). We also have the ability to have caps custom-fabricated with the dimensions you prefer.
from Long Island, NY asked:
March 27, 2017
I have an 8" X 8" and an 8" X 12" flue next to each other on a chimney. I need a custom cap that will fit over both and can still mount to the clay flue. The outside dimensions are 81/2" X 241/2." Is this possible?
Yes it is possible, or you could use a crown mounted cap.
from Clyde, NC asked:
March 1, 2017
I am looking for "knock down" or "unassembled" single flue caps. All I'm seeing is multi-flue. Do you have any suggestions?
The multi-flue caps are shipped knock down.
on March 1, 2017
from Newbury Park, CA asked:
February 15, 2017
I need a chimney cap and the opening is oval and 15 3/4 by 8 inches. What size do you think I should get?
For a crown mounted cap, you should measure from the outside edge of the the flue, rounding up to nearest inch.
on February 16, 2017
from Vacaville, CA asked:
January 30, 2017
I have a chimney that has an 8" x 20" oval flu, and 16" x 28" brick outer. I would like a chimney cap (with cover). What can you recommend?
Please provide the measurement of the flat portion of your concrete crown surface before the steep slope towards the outer brick chimney. Also, we will need to know how many inches the flue tile extends from this surface to determine the proper mesh height. As you are in California, any cap recommendation will incorporate 5/8" mesh.
on January 31, 2017
from Bend, OR asked:
January 25, 2017
I have a Tr344 chimney cap, presently, that I believe is more prone to creosote build-up with the outside of the pipe spark arrest or vein construction. The inside pipe has very little build-up, almost nothing. It is most prone during very cold days and nights. I have to wire brush it a couple of times a season.
Creosote will form once the flue gases fall below 225 degrees. If this happens before the gases clear the pipe, or in you case the cap, it will condensate on the cooler surface.
from Marietta, GA asked:
December 13, 2016
I have a direct vent chimney cap on a Martin model BW4245A fireplace and would like to switch to a vented gas log fireplace. Do you have a cross reference for what cap I need to install?
You would simply need to convert this back to a functional wood burning fireplace. Any refractory panels that may have been removed for installation of the insert will need to be replaced and the direct vent cap (and liner) will need to be removed and replaced with a cap that is safe for use with a wood burning fireplace. As the listed caps for Martin Industries fireplaces have been discontinued for quite some time and I have no access to the flue dimensions, please provide the inside and outside diameter of your chimney so that we may locate a universal cap.
on December 13, 2016
from Seattle, WA asked:
December 9, 2016
I would like to cap multiple flues that measure 29 1/2" x 12" overall. The outside dimension of brick chimney is 48" x 24".
We will be happy to make a recommendation. If you could, please let us know how far the flues extend off the top of the chimney.
on December 9, 2016
from Richardson, TX asked:
December 5, 2016
I need a 24" X 36" cap, with tabs to mount to the brick sailors.
The Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
has 3/4" reversible swing tabs at the base to allow for inside or outside mounting and 24" x 36" may be selected via the drop-down menu on the item page. If this is not what you are needing, please provide further details so that we may look into other options.
on December 6, 2016
from Santa Barbara, CA asked:
December 2, 2016
We are looking for an oval chimney cap for an older home. The unit is set onto an oval plaster shape over the basic chimney. After years, ours has was blown off in a strong wind.
We will be happy to see if we have anything that would fit. What are the dimensions of the flue?
on December 2, 2016
from New Mexico asked:
November 29, 2016
I need a high wind chimney cap for a pellet stove chimney.
from Denham Springs, LA asked:
November 27, 2016
Where would I find a chimney cap screen?
from Dallas, TX asked:
November 23, 2016
I need a cheap 24" X 36" cap; preferably in black galvanized.
from San Jose asked:
November 19, 2016
I'd like to use a cap that goes around the brick. Dimensions: 15 1/2" x 27 1/2". Do you have a cap to fit that size?
from Sacramento, CA asked:
November 16, 2016
I own several residences at South Lake Tahoe, California, which have custom fireplaces; all clean, but require chimney caps for new fire protection codes. How do I know which height: 8, 10, 12 inches high?
from Wiemar, Texas asked:
November 15, 2016
I have a 100+ year Catholic Church with a brick chimney. The outside dimension are 47" x 47", inside dimension 20"x 20". The boiler in the basement is exhausting into a 12" pipe into the chimney. I would like it to be side mounted and material to be 22 gauge copper with copper screen 8" tall.
from CT asked:
November 7, 2016
Would you have a chimney cap that is 10 inch high, with 3/4 mesh; 36" by 24"
from McMinnville, TN asked:
November 5, 2016
What size cap do I need for a CPF-2465569, 6" ID pipe?
from Tucson, AZ asked:
November 2, 2016
What is the correct way to measure for a chimney cap? We have a large fireplace; floor to ceiling. Do I have to go onto the roof to measure the opening?
from Salem, NH asked:
October 22, 2016
I have a single flue chimney for a propane furnace where the flue does not go to the top. I am looking for a top mount cap with flanges on the outside for mounting to the top of the chimney. The size I need is 16" x 16" to the outside of the flange. I do not know how high the screen should be for a propane furnace as far as air flow or draft. I plan to blot it and caulk it to the top of the chimney. Can you suggest the right cap for this? Thank you.
Based on your description, the Gelco Stainless Steel 15 in. x 15 in. Base Single-Flue Chimney Cap
would be a perfect match for your needs. The cap can be adjusted all the way to 16 1/2 inches on one side and 17 inches on the other. The cap has 8 inches of mesh height, which will work well for your needs.
on October 24, 2016
from Portland, OR asked:
October 17, 2016
My chimney measures 18 x 46 outside. Would i purchase a 17 x 45 cap?
If you are considering a product like the Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
, there are reversible 3/4" swingtabs located along the base of the mesh for mounting the cap to a chimney crown surface. As such, the 17" x 45" dimension you've provided would work.
on October 18, 2016
from Cary, NC asked:
October 17, 2016
I have just installed vent-free natural gas fireplace logs. I will not be using the fireplace anymore for "normal" wood burning fires. The inside damper will remain closed. Should I completely close off the chimney or install a vented cap? If a cap is recommended, how high of a cap would you recommend?
When installing a ventless log set, you should always follow the manufacturer's instructions included with that log set, however, only the damper should be closed, as a wood burning fireplace must remain fully functional when installing a ventless gas log set. You should not seal the chimney in any other fashion.
on October 18, 2016
from Green Bay, WI asked:
July 11, 2016
I have an air insulated chimney that measures 12 inches outside and 8 inches inside diameter pipe. Which chimney cap will vent the interstitial space?
from TX asked:
June 17, 2016
My chimney is topped with mortar. There is no flue rising from inside the brick chimney walls. How does the cap attach to the chimney in this case?
Please note that most local code offices will require the chimney flue to extend at least 2" above the tallest flue tile, but I recommend choosing a cap like the Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
as this will allow you to mount the base of the cap to your chimney crown surface using the reversible 3/4" swing tabs.
from Chula Vista, CA asked:
May 30, 2016
I am looking for a galvanized steel chimney cap for a Rampart General built chimney with a flue diameter of 11" x 11". There is no real 'external' flue tile to attach a cap TO: the old cap (rusted badly) has grab-bars that go INSIDE the flue.
on May 31, 2016
from Duxbury, MA asked:
March 23, 2016
How high above the top of the clay flue should the top of the chimney cap be and how much room should the cap from the flue be to provide clearance for installation? Does the cap come with flanged bottoms so the cap can be anchored to the mortar?
I would recommend at least 5" from the top of the clay flue to the underside of the chimney cap's lid to ensure that the chimney will not be restricted during use. Caps such as our Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
should be sized several inches beyond the length and width of the clay flue at a minimum to ensure that wind blown rain cannot enter the chimney. The multi flue caps due utilize a perforated flange mounted on piano hinges to the mesh screen which can be placed to the interior or exterior of the mesh screen. The flange may be mounted directly to the chimney crown with masonry anchors of your choice.
on March 23, 2016
from Woodland Park, CO asked:
March 9, 2016
We live at 8300 ft altitude. Chimney sweep tells us a special type of chimney cap is recommended (one without a mesh screen)... what are your thoughts? We have a wood stove vented out an 8' tall chimney.
At an altitude of this height, I would trust his judgement. While I have not heard of this type of recommendation, the thinner air at this altitude will negatively impact draft and the mesh commonly used in chimney caps does cause a very minimal restriction to the flow of flue gases while exiting the termination.
from Manchester, TN asked:
February 26, 2016
How do I measure my chimney to get an accurate measure for a chimney cap?
There is a wealth of information available on our site posted about this here.
on February 26, 2016
from Conyers, GA asked:
February 10, 2016
Do you have a chimney cap to fit a 15 3/4" x 15 3/4" flue?
from San Diego, CA asked:
January 17, 2016
I have an old chimney; flue interior dimensions are approximately 9.75" x 26.75" but it varies where the dimensions are taken. The exterior dimensions are approximately 14" x 31.5". I don't use the fireplace so I'm not worried about a spark arrestor or chimney draft. What sort of caps are available and what would you recommend?
If you are not intending to use the fireplace, the Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
chosen in a 30" W x 13" L dimension should work. Please note that this would need to be chosen with 5/8" California mesh and the chimney flue will need to be relined if you are needing to pass inspection.
on January 18, 2016
from Riverside, CA asked:
December 28, 2015
I have a Fireplace and every time that the wind blows from 5 mph to 50 mph I get a down draft and smoke in my house. This also happens when the forced air heater comes on. I have no cap on my chimney. What can I do to stop the smoke from entering my house?
Installing a cap will definitely help as this will create resistance to downdraft. In addition, it is always a good idea to install doors as this will further restrict downdraft to prevent backpuffing. Please note that diagnosing and correcting draft issues can prove to be difficult, especially when the hearth is on a perimeter and not an interior wall. When the fireplace and chimney is positioned in this fashion, a majority of the flue gases will be at or near outdoor temperatures, which can aggravate draft issues as cold air is more dense and will quite easily move into the home as replacement air. You have experienced this with your mechanical exhaust. As air leaves the home, air will be pulled from the easiest point of access, which will be your chimney, more often than not. Installing a cap and doors will restrict the home from pulling makeup air from the chimney.
on December 29, 2015
from ME asked:
December 2, 2015
I have a chimney that is 20 1/4" X 52 1/2" outside measurement. Do you have options for those dimensions with a 12 inch high screening?
on December 2, 2015
from Clarksville, GA asked:
December 1, 2015
I bought a house with just the opening in the chimney. I don't know what I'll need to put some type of cap on the top of it. I measure the outside of the top of the chimney and is 21" x 22". What would you recommend to cover this chimney?
If you are just looking for a cover to prevent rain and pests from getting in, the Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
will attach to the flat surface of your chimney. You will need to select a screen size that will mount securely to the flat surface using the reversible 3/4" swing tabs.
on December 2, 2015
from Roswell, GA asked:
November 24, 2015
I'm trying to determine which size of chimney cap to buy. I know i want to do one that covers the entire top of the chimney and not just the flue. I have a brick chimney with the outside measurements of the top being 25x29" and the flue itself sticks up about 3". What dimension of chimney cap should i order?
You may use a surface mount cap that is slightly smaller than your outer crown surface, yet larger than the outside dimension of your 3" flue tile extending from the crown. You will need to select a mesh height that is at least 5" taller than the highest flue tile extending from the crown for proper draft. The Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
is one example of a suitable option.
on November 24, 2015
from Phoenix, AZ asked:
November 23, 2015
Looking for some assistance with a Cap selection. As you may see the oval chimney liner was capped with concrete. The internal measurements are 10 6/8" by 13 3/8". This is surrounded with a 2 1/2" border. I realize that the cap can be mounted a number of ways - screw via cap brackets, slide in via legs and adhesive. What size of chimney cap should I get? What is the mounting Method? Should I use SS or Anodized Paint?
It appears as though there is a ledge around the perimeter of this chimney and this would be an ideal location to install a surface mount cap as any other option would do little to prevent rain intrusion. I am unsure of how tall that illustrated portion extends from this flat ledge, but a Multi-Flue Semi-Custom Gelco Chimney Cap
could be installed on this surface, so long as a mesh height is chosen that is at least 5" taller than the tallest portion of that elevated portion in the attached picture.
on November 24, 2015
from Littleton, CO asked:
October 27, 2015
The smoke from our chimney goes right into our neighbors yard and house (when they have a window open). Is there a chimney cap that can divert the flow of the smoke?
Unfortunately, no. Even if a cap has baffles on one side, there is still nothing to stop the flow of smoke once it has gotten away from the cap. I recommend considering a chimney extension to raise the level of the smoke exit above your neighbors home.
on October 27, 2015
from Hot Springs, VA asked:
October 22, 2015
My flue liner is flush with the top of the chimney. Is there a flue cap that mounts from the inside? My flue liner measures 7" x 7".
on October 22, 2015
from CT asked:
October 19, 2015
I have a multi-flued chimney that is rectangle that measures 8 x 8 and 8 x 12. One flue is taller than the other and stands approximately 5 inches above the crown. How much is required from the top of the flue to the cap?
For proper draft, you should maintain at least 5 inches of clearance from the top of the flue tile to the underside of the cap lid.
on October 20, 2015
from Warner, NH asked:
October 13, 2015
I need a chimney cap to keep the downpour rains from entering my chimney. My chimney liner is 9x9 inches but does not extend above the chimney top's surface much. I have a cap on the other chimney that is screwed into the mortar that surrounds the liner and it works well. My chimney dimensions is 18x26 inches with a single flue. What cap would you recommend for me?
from Fort Worth, TX asked:
October 7, 2015
I have a chimney that is currently covered by a piece of metal mesh and I am looking at putting a better solution on top of my chimney. The flue(exhaust) is 8" x 16 1/2". The outer measurements (to the actual brick) 30" x 47 1/2". Since the actual flue lining does not stick out of the top of the chimney I am not sure I can just put a cap on it as I have nothing but the mortar to screw, glue or nail it to, and I'm not sure that is possible or recommended. What would you suggest?
In a situation such as this, I would suggest a top mount style chimney cap such as our Multi-Flue Semi-Custom Gelco Chimney Cap
as you can specify the screen to screen dimensions to best suit your chimney. This type of cap utilizes tapcon style concrete anchors which are put through the perforated flange around the perimeter of the mesh screen. These anchors are then drilled into the chimney crown for a secure installation.
on October 8, 2015
from MA asked:
October 5, 2015
I'm looking for a cap that will fit a chimney flu that is 6 3/4 inches x 6 3/4 inches - inside dimension. The flu is flush with the cement cap. What would you suggest?
from Homeworth, OH asked:
October 3, 2015
If my chimney flue measures 12 x 12 1/2 inches, what size of chimney cap should I get? I need one with a damper as well.
from Cincinnati, OH asked:
September 17, 2015
Can you tell us what type of chimney cap to look for for a 100 year old stone chimney? It has no clay pipe liner to attach a normal cap to?
If the top of the stone chimney is somewhat flat, you could utilize an item such as our Multi-Flue Semi-Custom Gelco Chimney Cap - 8" High Mesh
as these are available in many sizes to match almost any size chimney. It the leading edge of the chimney does not provide a flat or even surface, I would suggest having a layer of cement laid atop the stonework.
on September 17, 2015
from Los Angeles, CA asked:
September 8, 2015
My chimney measures 21 1/2 x 21 and does not seem to have a flue. There is an oval hole down the center of the chimney which is about 9 1/2" x 11". There is now flue or lip protruding above the mortar at the top of the chimney. The mortar is sloped or angled and rises about 3" above the bricks.
What sort and size of chimney caps should I consider?
on September 9, 2015
from Seminole, TX asked:
August 9, 2015
I have a chimney flue that is 17 1/2" x 13 1/2". Would a chimney cap that is 18" x 14" work for that size of chimney?
Yes, assuming your chimney wash extends out far enough to provide a surface for mounting the cap, an 18" x 14" should serve you well. You will need to order a cap that provides a minimum of 5" of clearance between the top of your flue and the bottom of the chimney cap lid.
on August 9, 2015
from Westminster, CO asked:
August 7, 2015
My double flue chimney pipe is approximately 49 x 19 and my chimney is tin that is designed to look like masonry. Must the cap be screwed into the tin, or is there some sort of corner mount system available?
These caps are designed to be adhered with sealant and then screwed into a masonry chimney crown.
on August 7, 2015