The "FC Series" fan-cooled & ventilated NEMA 3R outdoor/indoor enclosures are an inexpensive choice for installation where you need air-flow exchange to ventilate your components mounted within enclosures. However, please keep in mind fan-cooled & ventilated enclosures simply exchange internal air for the external air. Therefore, Fan-Cooled models are not recommended for extreme high-temperature nor extreme low temperature environments. Because these units pull external air into the enclosure through a filtering system, they are listed as NEMA 3R and do not meet the NEMA 4 standards of Mier's air-conditioned and heated models (ACE Series or ACHT Series) which are the safest choice when your components need NEMA 4 type protection from the elements such as moisture, heat, cold, wind, rain, snow, ice, etc., or from wash down conditions.Dimensions: 18" W x 16" H x 10" DColor: GrayOutdoor, NEMA 3R DesignNon-metallic polycarbonate enclosure allows you to place transmitters/receivers inside81 cubic foot-per-minute thermostatically controlled fanAir intake and fan exhaust protective shrouds with gasket and hardwareAir filterAll holes pre-cut to install included shrouds, fans, filtersGasketsRemovable hinged doors come with stainless steel latches which are both pad-lockable and screw down