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sbkim 10-18-2012 01:54 PM

Furnace Vent Cover?

I am curious for you HVAC experts whether a wire mesh cover is necessary for furnace vent on the roof? My HVAC guys says no way since it could lead to ice build up etc and looks like placed a 45. I tend to think you need something to prevent birds from nesting? Please disregard red circles - I recognize some of these are NOT hvac but just bath vents and radon vent.

Your thoughts?

Here is the cover I was thinking:


techpappy 10-18-2012 02:40 PM

I earlier said on different problem but, did not realize you were talking about furnace vent so must retract...I have seen mega ice build up on units wthout screens so, definitely do not add screen

beenthere 10-18-2012 02:45 PM

Thats one of the good ice makers. Known to have caused many many no heat problems.

In areas where it is code to put one in. After it passes inspection, I remove it.

sbkim 10-18-2012 03:27 PM

Wow - great info. Thank you so much guys. For sure, I am not going to put guards on HVAC vents but what about:

1. Passive radon pipe
2. Bathroom fan

Am I asking for trouble by putting grill/guards on these - see pictured above?

Many thanks and sorry for stupid questions...

Marty S. 10-18-2012 04:39 PM

Leave them open. Birds rarely try to nest in straight vertical pipes. They'll probably like the neck on that 45 though.

ben's plumbing 10-18-2012 05:43 PM

if you were in my area alot of contractors would say put it in....why because it creates service calls it will ice up and shut down your furnace.....want to know how much a call for going up on the roof in the dead of winter....well lets just say.. leave the screen out....:yes::yes:ben sr

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