Is there any functional difference between the METAL cap and the MUSHROOM cap?
There is NO functional difference between the two caps. It’s just a matter of personal preference. Some customers like the METAL cap because it looks like their furnace vent. Other people prefer the MUSHROOM cap because it is made of durable PVC plastic. Although they function the same way, they are attached in a slightly different manner: the mushroom cap screws onto the filter, but the metal cap is attached by friction. • Doesn’t the filter restrict the airflow? The filters do restrict the air flow somewhat. The restriction is so slight that it shouldn’t interfere with normal venting of the plumbing system. • My plumber installed a vent pipe extension. Do I remove the extension or place the OdorHog over the vent extension? Remove the extension. We have found that when an OdorHog is placed over an extension, the whole extension and OdorHog assembly act as a “sail” in the wind. The assembly will begin to oscillate in the wind. This could potientially damage your rooftop vent flashing a
