Vent Increasers

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AmeriVent 3EIX4 Increaser, 3 x 4 in, Aluminum Alloy/Steel

The increaser is used to increase vent size. A max of 4 step of increase.
$11.99

LAMBRO 250 Vent Increaser, 3 to 4 in, Aluminum

Increases from 3 to 4 in.
$6.99