N967 Quality Drive
Greenville, WI 54942
920-750-7138

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Craig W.

Craig W.


Job Checkin

Replaced both bath exhaust fans with customer provided units. Also ran 4” hard pipe from each fan to the J-block vent on exterior of attic gable end. Sleeved the hard pipe with 4” insulated flex to insulate it from attic temperature extremes. Checked CFM on each fan with a balance hood and found master bath to be pulling approximately 85 cfm and the hallway bath fan to be pulling approximately 75 cfm. The fans are rated at 110 cfm each but the loss could be due to length of runs and the number of elbows in each run (2). Also found that there was window screen wrapped around the J-block vent which I assume was to keeps bugs out. This screen was plugged with dust and dirt so I removed it to facilitate better operation of the fans. Left old fans onsite in case owner wanted for any reason. Thank you for choosing Black-Haak Heating. Please take a moment to fill out our online survey.