Christopher Molnar, LLC


Building Envelope Testing
(Blower Door Test)

How Much Money are You Wasting?
Do you like paying for power that is being used to cool the rest of Florida?
Do you like feeling warm drafts and warm spots in your home all Summer with your air conditioning set to a low temperature?
Do you like to hear your Air Conditioning running non-stop and not getting cool enough?
Do you like feeling muggy and humid in your own home?
Do you like having more smells and odors in your home than you think you should?
Did you know most Florida homes are blowing up to 30% of their cooling costs out the door?

If you answered “no” to any of these questions then it is time to request a blower door test.

The Blower Door Test is designed to test the tightness of the house. We are looking to find out how much air is leaking into and out of the conditioned spaces of the structure. The greater the leakage, the more conditioned (cooled and heated) air will flow through cracks, crevices, and other openings in the walls and ceilings, thus raising the energy bills and also decreasing indoor air quality. Florida energy code says that new and retrofitted construction must be tested by an independent third party and must be within 3-7 air changes an hour. By air changes per hour we mean how many times per hour 100% of the indoor air will be replaced with the outside air. The greater the temperature difference between the inside and the outside the faster the air will flow naturally. This air movement costs money as you are paying to cool or heat the air.

By following a set test procedure, we are able to identify not only how much air is leaking out of your home, but we are able to locate the source of these leaks.

The Blower Door Test Procedure:

1. Walk around the exterior of the building to examine the building envelope.
2. Close all open windows and doors.
3. Verify the operation of any appliances prior to testing and ask homeowner to sign off on anything that is not operational.
4. Make sure any fireplaces are clean and all gas fueled appliances are shut off.
5. Make sure HVAC system is turned off.
6. Setup and install test equipment in an exterior doorway.
7. Run the computerized test sequence.
8. Review the report for leakage rates.

Locating the Leaks:
1. Restart the blower door test equipment.
2. Set for a constant speed and pressure.
3. Use a smoke pencil to locate any areas where the air is being pulled into the building.
4. Discuss with homeowner the best way to repair the issues.
5. Provide a written report that the homeowner can use for DIY or share with a handyman.

Cleanup all Equipment and Return to Normal Operation:
1. Restart HVAC system.
2. Restart all gas fueled appliances.
3. Make sure homeowner is satisfied with the cleanup and everything works.