Marley EFF1500 Qmark Electric Ceiling Mounted Heater A fan delay is standard on all units to prevent the unit discharging cold air before the heating element warms-up The front cover is heavy-duty stamped steel with 1/4" mesh backing the louvers to prevent the insertion of foreign objects The front cover is heavy-duty stamped steel with 1/4" mesh backing the louvers to prevent the insertion of foreign objects