Question 1

What is the function of a roof vent cap? Does it keep rain water out of house, or just keep animals out?

Accepted Answer

It does both keeps rain and animals and bugs out. You have to buy the vent collar separately though. So you can connect your exhaust hose or dryer hose to it because some vents on the roof are just for ventilation in your attic space. Them vents you can’t hook your exhaust too. Proper ventilation is key to saving money in your house. I’m going threw the same problem at the time. Make sure you never just vent your fan to your attic space that’s a no no. Also if your fan is anywhere by water make sure your fan is wired inline with a GFCI it’s just the way to do it. Hope this helps you out

Question 2

I have a 12 in wide metal roof and I need to put a vent  to vent out heat from the roof . Would the brown 636 work to do this.

Accepted Answer

It could probably be made to work, but that's not what this vent cap was intended for.  It has a flap in it that is normally closed, that would have to be removed.  (This vent cap is normally used for a bathroom vent fan that will push the flap open when the fan is running.)  Depending upon the style of metal roof you have, it may be difficult to get this vent cap sealed properly.  This one is designed to have its upper flashing edge under shingles.  If your "12 in wide metal" is in horizontal rows, that may work.  Also, this vent cap is significantly smaller than what it normally used for roof vents.  It will probably take three times as many of these as regular roof vents, to vent a given area of roof.  In short, yes it probably could be used for a roof vent, but it would not be ideal.

Question 3

Can the damper get frozen shut in the winter?

Accepted Answer

It's possible, but not too likely.  And even if it does, when the bath fan is turned on there will probably be enough air leakage that it would thaw the flap in a minute or two.

Question 4

pulled flapper,  replaced cheesy strip at front of flap and  added to other three sides with 3/16 thick, 3/8 wide foam weather strip.  is this ok?

Accepted Answer

Maybe

ASIN	B000BQW6LE
Additional Features	Backdraft Damper, Bird Screen
Best Sellers Rank	#57,384 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #88 in Household Ventilation Fans
Brand Name	Broan-NuTone
Color	Black
Country of Publication	Mexico
Customer Reviews	4.5 4.5 out of 5 stars (752)
Finish Types	Black
Global Trade Identification Number	00026715000609
Included Components	Roof Cap, damper, birdscreen
Item Dimensions D x W x H	76.2D x 20.3W x 15.2H centimeters
Item Form	Roof
Item Type Name	Roof Vent Cap Only
Item Weight	726 g
Manufacturer	Broan-NuTone
Manufacturer Part Number	636
Material Type	Alloy Steel
Model Number	636
Mounting Type	Roof Mount
Number of Items	1
Number of Packs	1
UPC	696335226149 026715000609 049403210210 735090814458
Unit Count	1 Count
Ventilation Type	Ducted/Vented

Broan-NuTone 636 Steel Roof Vent Cap for 3" and 4" Round Duct, For Bathroom Ventilation Fans, Black

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