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Functioning of the rectifier grille

For several reasons shops and public buildings keep entrance ways open. In shops open doors have an inviting effect and contribute to a customer friendly approach. In industrial buildings open entrances make transport easier and faster. But warm inside air escapes through the open door to the outside and cold outside air enters the room, causing draught problems. In summertime the reverse may happen as well. With a Biddle air curtain with patented rectifier above the open door, these problems vanish into thin air. The unit takes in warm inside air and discharges the air stream right down to the floor. The function of the rectifier is to stabilize the air turbulence created in the fans and discharge in a laminar air stream. The warm air now circulates back into the building and benefits to the inner climate, instead of escaping to the outside.

	Open door with Biddle air curtain with rectifier grille Air stream reaches the floor at lowest possible speed, so that maximum passing-through comfort is guaranteed Theoretical efficiency > 90% Heat from the air curtain benefits the indoor climate
	Open door with air curtain without rectifier grille Because of turbulence, air stream does not reach the floor so the door is not screened enough Inefficient because of heat loss Still draft across the floor
	Open door without air curtain Much energy loss due to heat loss through open door Draft and cold in the building

Only Biddle air curtains are provided with the patented rectifier. The Dutch research institute TNO has found out that the highest possible comfort and best possible penetration of the air stream is achieved using Biddle air curtains with the patented rectifier. Energy loss is minimized and the temperature in the building remains agreeable.