NQ and NF Panelboards applications include commercial buildings, industrial buildings, data centers, stadiums, and offices. NQ and NF Panelboards are versatile panelboards that feature a wide selection of circuit breakers, accessories, and ready to install kits. These panelboards have many different options for your enclosure box and its accessories. This enclosure cover is a ventilated steel Type 1 for flush mount NF and NQ panelboards. This cover is for a 20 inch width x 50 inch height box. NQ and NF enclosures are UL listed for use in the USA and Canada.