8102 EVERGREEN WAY EVERETT 4 CORNERS - BLDG D 2025-08-06

four corners Apartments Ventilation System Project Narrative Each residential unit contained within this project will receive the following EXHAUST SYSTEM Range Hood-100 cfm fan originating from over stove (appliance provided by others this permit is for ductwork only)6" rigid 26-gauge steel duct to exterior,with Metal Fab 6" MRCD UL 555C ceiling radiation damper at first drywall penetration above cabinet,termination cap with backdraft damper and screen. Dryer Vent-4" rigid 26-gauge steel duct to exterior,termination cap with backdraft damper no screen, originating in wall with dryer box connection system. Dryer Duct system will be contained In fire rated drywall shaft for fire protection. Dryer ducts are installed per manufacturer's instructions,all lengths meet manufacturers criteria.there are no vertical changes in concealed duct runs that will require cleanouts.the point of origin in the laundry room wall is the clean out point. each laundry room is provided a 100 sq inch 8"x14" makeup air opening. Bath Fans-90 cfm AIR KING FRAK90 at 1.5 sone UL 555C fire rated fan operated by switch at wall,4" rigid 26-gauge steel duct to exterior,termination cap with backdraft damper and screen where applicable when two fans are connected to one duct to exhaust termination, 6"duct will be used to upsize for airflow volume. Whole House Fan-Orbit ODU814H .5 sone UL 555C fire rated fan continuous operation in laundry room of 4 and 5 bedroom units. 50 cfm Air KING FRAK50 0.5 sone UL 555C fire rated fan continuous operation in laundry room of all units. 4" rigid 26 gauge steel duct to exterior, terminatiorj cap with backdraft damper and screen where applicable when two fans are connected'to one duct to exhaust termination, 6"duct will be used to upsize for airflow volume. . • Same system at roof level.All ducts through roof to ventilation specific roof jacks fully supported and insulated (insulation by others).