FAIRBANKS — The “Ask a Builder” alternation is committed to answering some of the abounding questions Fairbanks ociation accept about building, activity and the abounding added genitalia of me life.
Q: You’ve apparently heard us acknowledgment the “blower aperture test” back talking about activity ability or retrofitting. So what is it?
A: A blower aperture ysis measures w bankrupt a architecture is — or w abundant air leaks through openings in the walls, roof and floor. During Alaska’s continued winters, balmy air aperture out of baby openings in a building’s envelope represents cogent activity absent to the outdoors. The blower aperture ysis determines w abundant air is aperture and area it’s advancing from, so you can booty accomplish to accomplish the architecture added airtight. On the added hand, if the blower aperture ysis sws the architecture is essentially airtight, you suld accomplish abiding your blast arrangement is accouterment abundant beginning air to aculate occupants healthy.
Building inspectors, activity raters and added professionals are accomplished in application a blower aperture apparatus. The ysis takes about an ur, including basic and breakdown, admitting it can booty best in beyond or leakier uses.
First, the tester makes abiding all exoteric windows and doors are bankrupt and turns off the aation appliances, such as boilers, furnaces and copse stoves; blast systems; and bankrupt fans, such as the bath admirers or clothes dryers. These accessories all bankrupt air carefully and do not represent the air arising being measured. Finally, it’s important to accessible autogenous doors so air can breeze advisedly aural the use.
Next, the tester will set up the blower aperture in an exoteric aperture of the me. Like the name implies, the blower aperture consists of a ample fan placed in the doorframe with nylon continued over the actual opening, autritative it airtight. The accessory uses a manometer that compares the air burden outside, the air burden central and the fan acceleration to account the air arising rate. The manometer can be aculated with a computer active software that runs orted direct tests to ensure greater accurateness than a distinct chiral test.
During testing, the fan ault air out of the use, autritative the autogenous a lower air burden than the outdoors. Typically, the able uming the ysis will address the air arising amount of the architecture as the cardinal of air changes per ur at a burden of 50 Pascals (ACH50). For instance, if the blower aperture ysis sws an air arising amount of 4 ACH50, that agency all the calm air would leave the architecture four times per ur to be replaced by alfresco air.
For reference, an air arising apprait of 4 ACH50 or beneath is appropriate for a me to accommodated Alaska’s Architecture Activity Ability Standard. The accompaniment actomed this accepted to advance activity able construction, and it is appropriate by some
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