The 3″ x 4″ Appliance Increaser is used to increase the vent diameter from 3″ to 4″. It is installed directly on top of the appliance. It can only be used to increase your venting from 3 inches to 4 inches. It can be used with natural gas or liquid propane, Category 1 appliances.
-36%
Duravent 3BVAX4 3″ x 4″ Appliance Increaser – B Vent
$37.44 Save:$21.00(36%)
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