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Question DetailsAsked on 11/9/2016

my fake chimney vent on my roof needs repair or new cap. it originally looked like a brick chimney but is metal.

The top of the cap seems to have four points attached to the roof vent and one or more is no longer attached causing noise is heavy wind. This is not a masonry chimney and vents my furnace and water heater I believe. not sure if a new cap is available to cap the metal fake chimney vent. It is square and probably stainless steel or aluminum.

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2 Answers


If you are up to going up there, take a couple of screwdrivers and a few sheet metal screws - the small screws used to mount these commonly rust enough to fall out, and you just need to put in a slightly larger one. Pop rivets work too, but of course more work to remove nexxt time a chimney sweep or HVAC contractor needs to inspect up there.

Otherwise, if a pretty flat rain cap like following link (though more commonly square) - which would be a fireplace chimney like a ready-set, where the "flue" is double-wall stainless pipe from the firebox/fireplace, then a Chimney Sweep can fix or replace it - as can a Handyman. (Note sometimes wood burning fireplace chimneys are repurposed to carry HVAC ducting instead). Should have screening to keep insects and critters from accessing the chimney and to control sparks if a fireplace chimney -


If this is truly a heating system vent cap, then screening is commonly NOT used in sub-freezing areas, because the moist exhaust air (which is not very warm by the time it gets up there) can freeze up on the cold screening, so louvered caps are used like the following - note this one is a low-temperature rated PVC one for condensing (high-efficiency) systems (with exhaust fans) - for gravity vent systems (no exhaust dampers or fans) it must be metal, as must the double-wall "B vent" ducting.

Heating and A/C contractor or Handyman should be able to refasten or replace this no problem.

Answered 4 years ago by LCD



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Answered 4 years ago by Member Services

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