Ring E for Blower Door Fan
Blower Door Fan Flow Ring E
Ring E is an optional flow ring for Model 3 & 4 Minneapolis Blower Door™ fans. Ring E measures air flows between 45 - 11 CFM.
Ring E attaches inside Ring D by rotating the 3 fastener clips. When using Rings D and E, fan pressure is measured by using the pressure tap mounted directly on Ring D, rather than the tap on the top of the fan.
Please note that Ring D is required when using Ring E with the Minneapolis Blower Door™ fan. Ring D is sold separately.