WAP Blower Door Data Sheet and Standards - TDHCA - tdhca state tx 2026

1. Click ‘Get Form’ to open the WAP Blower Door Data Sheet in the editor.
2. Begin by entering the client's name and job number in the designated fields at the top of the form.
3. Measure and input the square footage, ceiling height, and total volume of the unit. Use the formula Length x Width x Height for total volume.
4. Determine the N Factor based on the provided chart, selecting the appropriate value for your building's height and shielding.
5. Calculate the Building Tightness Limit (BTL) using the formula: BTL = .35 x Volume x N / 60. Enter this value in its respective field.
6. Record your initial CFM reading after pressurizing the unit to 50 Pascal. Note any ring numbers used during measurement.
7. Calculate and enter the Minimum Reduction Value (MRV) based on your initial reading and reduction percentage from the table provided.
8. Complete subsequent readings as required, ensuring all calculations are documented accurately for final verification.

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