Doggy Doors...What to do?

Replies to This Discussion

Permalink Reply by Sean Lintow Sr on November 5, 2012 at 5:20am

Replace it with one that has two doors (one on each side) & magnets - they work great

I can't recall the brand but the last few I got were at Home Depot & I think I even saw them at Lowe's

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Permalink Reply by Curt Kinder on November 5, 2012 at 6:56am

Most pet flaps have some sort of positive closure, magnet or similar, and for the most part they work OK, although some air works its way around the flap's perimeter.

What I think happened here is that the blower door test pressure, which far exceeds natural pressure, overwhelmed the flap's magnet and it swung open, allowing an extra 1300 CFM. That should not occur under normal, non-blower-door test conditions.

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Permalink Reply by Sean Lintow Sr on November 6, 2012 at 5:40am

Let me call Bull - if the blower door could pull it open, that means the wind will easily blow it open as it wasn't able to resist one pound of pressure (PSF) --- for more see Pascals & Pressure 

Either the magnet is shot, it is filthy, or the unit is worthless, which is one reason why I like the double flap system

 

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Permalink Reply by Patrick Michaelyan on November 6, 2012 at 12:26pm

I appreciate the frankness Sean (I really do).

Let me look into this flap again, and maybe these folks are looking at the POS series pet flap.

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Permalink Reply by Curt Kinder on November 6, 2012 at 3:46pm

The blower door test pressure of 50 Pa is roughly equivalent to a 20 mph wind, which is quite uncommon in most areas

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Permalink Reply by Bob Blanchette on November 9, 2012 at 8:34pm

Unless you live in Oklahoma.

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Permalink Reply by Patrick Michaelyan on November 6, 2012 at 12:24pm

Thanks Curt.

I have to look at this flap again. It appeared to fit by friction.

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Permalink Reply by peter chang on November 6, 2012 at 5:28pm

Locating pet doors on a relatively sheltered wall of the house could help. I've been designing a two door doggie airlock in my head. It would be disguised as a bench (or banco in my neck of the woods), be heavily insulated, and vented to the exterior to disperse pulses of wind back to the outside of the house. If the vent could exhaust around a corner from the exterior flap that would be best, and it should have some kind of a flapper to reduce air coming in it. Or build the whole thing on the outside as a tunnel with exterior door at the end and vents both sides.

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Permalink Reply by Bob Blanchette on November 9, 2012 at 8:35pm

Locating Doggie Doors on South or East walls helps a lot.

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Permalink Reply by Glen Gallo on November 6, 2012 at 9:25pm

worry more about the other 4000 cfm

the air coming from the dog door is fresh air

Where is the other 4000 cfm coming from?

S

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Permalink Reply by Ron Jones on November 15, 2012 at 9:02am

I recently had a similar situation, only the doggy door was big enough for an adolescent to crawl through. When I told my client she should consider replacing the door, she waxed nostalgic about the happy times when her dog and children would chase each other through the door. She made it clear she'd never replace the thing. I still haven't done any work for her.

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Permalink Reply by Troy Spindler on November 15, 2012 at 11:35am

Another trick I've seen is to dedicate the bottom half of a cabinet as a vestibule/mud-room with a second air-lock flapper like Peter suggests.  Obviously you'ed need to design some people access to clean it out occasionally, but I agree with Glen re. the other 4000 cfm. 

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