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Selection

An air curtain should be selected so that it has sufficient capacity to heat up the coldentering air to a comfortable temperature.Additionally,the unit should be able to screen off the entire doorway.The selection of an appropriate air curtain depends on: 1. Door height or width 2. Situation (building) ?Favourable conditions: no direct wind attack,a sheltered location,internal (inside) doors. 2.Situation (building) The conditions at a doorway vary continuously,leading to difficulty in determining the volume and temperature of outside air entering the building.Other aspects such as multiple open doors in a single room,or the orientation of the building may also have a large influence on the capacity need.To make selection easier for you,please use the following guidelines. ?Normal conditions: little direct wind attack,no open doors opposite one another. 1.Door height or width The door height or width is measured from the bottom or side of the unit.These are known data,so based on the table at the bottom of this page it is easy to select your air curtain.It is important for the air curtain to be positioned close to the door with a minimal gap.In addition,the air curtain should be at least as wide or high as the door opening,as a too short air curtain will lead to air leakages on the sides or at the top. ?Unfavourable direct wind attack on open door,multiple open doors, conditions: large mechanical extraction rates,location in opencountry. The above selection table is for indicative purposes only.If in doubt,please contactBiddle for advice. Door height/Conditionswidth
1 FavourableNormalUnfavourable3 - 4 m IndAC SIndAC SIndAC M
4 - 5 m IndAC SIndAC MIndAC L
2 5 - 6 m IndAC MIndAC LIndAC L-W3
6 - 8 m IndAC L--
1 Mounting height,measured from the bottom or side of the unit. 2 The L-type will be available by mid-2007.

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