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Customer Q&A with Product Specialists

Joseph M. from Cranberry Twp, PA 16066 asked:
Hello, is the 3" Vacu Stack approved for use in venting a 40,000 BTU gas water heater? Can it be attached to a 3-inch corrugated aluminum chimney liner, or does it require a double-wall liner? Thanks, Joe
Hello, is the 3" Vacu Stack approved for use in venting a 40,000 BTU gas water heater? Can it be attached to a 3-inch corrugated aluminum chimney liner, or does it require a double-wall liner? Thanks, Joe
Hello Joe, the 3" Vacu Stack Chimney Cap is designed for Class A chimney components. For a 40,000 BTU gas water heater, venting typically requires Type B gas vent systems or specialized gas appliance vents, which often use aluminum flexible liners. These systems are generally not considered Class A chimney components. Therefore, we cannot confirm if the Vacu Stack is approved for use with a 3-inch corrugated aluminum chimney liner or if it is suitable for your 40,000 BTU gas water heater. It is critical to consult your gas water heater's installation manual to determine the approved venting types and components, and to ensure compliance with all local building codes.
Answered by: Tyler M. on Jun 26, 2026

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Roger K. from Longview wa asked:
Is there a vaccu stac for a masonary chimney with the rectangle top, 12"x16"
Is there a vaccu stac for a masonary chimney with the rectangle top, 12"x16"
Vacu Stack does make this masonry adapter.
Answered by: Kathy O.

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