  3" & 5" HIGH SPEED VENT CAPS High speed vent caps are required by Modine for horizontal venting and recommended for vertical venting especially in areas that experience winds over 35 mph. They are available in 3" and 5" models and are manufactured from galvanized steel. The 3" cap is used for all vertical venting and horizontal venting in greenhouses, commercial structures, shops, and garages that are not attached to a house. The 5" cap is needed for horizontal venting in garages or other structures directly attached to a house.
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