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Blower Door Fan Flow Ring Set
Replacement standard flow ring set for the Model 3 and 4 Minneapolis Blower Door™ fans with rings A, B and a no flow plate. Ring A installed measures air flows between 2800 and 915 CFM. Ring B installed inside Ring A measures air flows between 1100 and 300 CFM. The no flow plate closes off the fan air flow for baseline readings. The ring set is held to the inlet side of the fan with a collection of turn clips installed at the outer edge of the fan housing. Additional lower flow rings C, D and E are available and sold separately. Replacement ring fasteners are also available, contact TEC for more details.
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