High density polyethylene for a durable, long life even in severe climate. Includes screens to protect against the entry of small animals and large insects. No moving parts, eliminates freezing or sticking potential. Part Numbers: 99-185 - Two 5" Diameter hoods, 12" wall sleeve, duct collar, white plastic 99-186 - Two 6" diameter hoods, 12" wall sleeve, duct collar, white plastic 99-187 - Two 7" diameter hoods 99-186LT - Two 6" diameter hoods without sleeve or collar

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Lifebreath Weatherhood  Installation Notes Fixed covered weatherhoods have a built-in bird screen with a 1/4 in (6 mm) mesh to prevent foreign objects from entering the ductwork.  The inner and outer liners of the flexible insulated duct must be clamped to the sleeve of the weatherhoods (as close to the outside as possible) and the appropriate port on the HRV. It is very important that the fresh air intake line be given special attention to make sure it is well sealed. A good bead of high quality caulking (preferably acoustical sealant) will seal the inner flexible duct to both the HRV port and the weatherhood prior to clamping. The flexible insulated duct that connects the two outside weatherhoods to the HRV should be stretched tightly and be as short as possible to minimize air flow restrictions. Twisting or folding the duct will severely restrict airflow.