I did an audit yesterday and found out that a single doggy door was responsible for 1,300 CFM50 of air leakage (in an already-leaky house...total leakage of 5,300 CFM50 and only 2,200 square feet of conditioned floor area).

So, what to do about this doggy door? I could spent some time thinking of a clever way to address this, or do some research online, but I thought of y'all first, as the preeminent professionals.

Any advice?

Thanks,

Patrick

Views: 555

Reply to This

Replies to This Discussion

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

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.

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

 

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.

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

Unless you live in Oklahoma.

Thanks Curt.

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

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.

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

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

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.

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. 

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Energy Center University posted an event

Better Buildings: Better Business Conferences at Crowne Plaza Chicago O'Hare Hotel & Conference Center and Kalahari Resort and Convention Center

February 26, 2015 to March 13, 2015
Better Buildings: Better Business ConferencesFebruary 26−27, 2015 │ Rosemont, ILMarch 11−13, 2015 │…See More
2 hours ago
Kris Grube added a discussion to the group Job Board
Thumbnail

Good Energy Retrofit, Portland, Or. Hiring Home Performance Salesperson.

Good Energy Retrofit is a small and focused, woman owned and operated, specialty residential…See More
6 hours ago
Benjamin Gromicko posted events
7 hours ago
Nate Adams joined Diane Chojnowski's group
Thumbnail

Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues…See More
8 hours ago
tedkidd commented on Diane Chojnowski's group Hall of Shame
"Give this thread a bump - here's my "bad" album and some of the…"
8 hours ago
Eric Kjelshus commented on Adam Swain's blog post Top Worst Crawl Space Insulation Ideas
"6) Radiant barrier- under the gravel is just a barrier but with holes each square inch its not a…"
8 hours ago
tedkidd replied to Luis Hernandez's discussion Distribution Efficiency and heating safety factor in TREAT in the group TREAT Software
"It is very common to find equipment grossly oversized. I mean 1.5 - 2x Manual J and 2-3x the size…"
8 hours ago
tedkidd replied to Luis Hernandez's discussion Basic Heat loss information in the group TREAT Software
"Luis,  Click "selected reports, energy savings and use, design heating and cooling…"
9 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service