Model IndAC
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Optimal work climate with open doors Industrial air curtains Model IndAC

Industrial air curtain Optimal work climate During loading and unloading the door remains open, without the indoor climate being disturbed. Industrial building doors are often open for long periods of time to facilitate transport in and out of the building. However, open doors can result in a loss of heat to the outside and the ingress of cold air. This disturbs the climate within the building, which leads to draughts. Internal transport does not want to be hindered by closed doors either, the internal doors between production halls and storage spaces for instance, are open all day long. If...

Both above and next to the door IndAC air curtains can be installed directly above or next to the door. Different installation positions are possible depending on the room layout around the door (see page 7). Modular design The modular design of the IndAC facilitates the installation of multiple devices next to or above each other, in order to cover any door heights or widths. Easy to mount and clean The various parts of the IndAC are very easy to access, making it easy to install, maintain and clean. The unit contains a minimum of ‘internal obstacles’, resulting in a smooth air flow...

Technology When a door is open, the difference between the outside and inside temperature leads to an exchange of air, resulting in cold air entering and warm heated air flowing out. An air curtain above or next to the open door provides separation of the two climates. Whilst developing the IndAC, Biddle has researched the outlet discharge pattern. The result is the Double Rectifier. Fan offering air-engineering benefits Patented Double Rectifier The IndAC is equipped with radial backward curved fans which homogeneously distribute the air across the whole discharge opening, producing high...

Selection An air curtain should be selected so that it has sufficient capacity to heat up the cold entering 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 The door height or width is measured from the bottom or side of the unit. These are known data, so based on the table below it is easy to select an 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...

Various options Typecode IndAC S-150-W1-2R Types S = Small M = Medium L = Large XL = Extra Large Unit length (cm) 150 - 200 - 225 Coil type W1 = Water heating high water temperatures W2 = Water heating medium water temperatures W3 = Water heating low water temperatures E = Electrical heating A = Ambient, no heating coil Installation position 0 = Horizontal, above door 1L = Vertical, left side, square to wall 1R = Vertical, right side, square to wall 2L = Vertical, left side, parallel to wall 2R = Vertical, right side, parallel to wall Variants The industrial air curtain is available in four...

Diversity in installation positions The available room layout around a door determines where and how an air curtain can be best installed. Thanks to a diverse range of installation positions, the IndAC air curtain can be matched to the constructional possibilities offered by the local situation. Model IndAC should be positioned above or next to the door, covering the full length or width of the doorway. Depending on the situation, the air curtain is either installed horizontally above or vertically next to the door. There are a total of five installation positions, which are shown below....

Control options Three types of controller are available: Basic, Plus or Automatic. 1. Basic controller The five-speed controller allows you to match the air volume to different conditions. The controller has a rotary control switch for five speeds, a neon indicator and an input for a door contact switch. Electric heated units can not be controlled by the Basic controller. 2. Plus controller Basic controller: Five speed controller with neon indicator and a connection for a door contact switch. The Plus controller has two switches with five speeds: 1 = with open door 2 = heat demand when door...

Electrical connections Interlinking units and connecting Basic controller IndAC 150 connection cable delivered by Biddle thermal contacts fan motors thermal contacts fan motors fan motors thermal contacts fan motors thermal contacts fan motors thermal contacts fan motors thermal contacts fan motors connection cable delivered by Biddle connection cable delivered by Biddle ve-speed controller ve-speed controller ve-speed controller Connecting Plus controller connection to unit (see above) connection to unit (see above) connection to unit (see above) wired by Biddle restriction of unit wired...

Technical data Water Heating The air displacement values are less when a filter module is used: IndAC S: 10% and IndAC M: 15 %. Based on normal circumstances. For selection see page 5. The max. allowable discharge outlet temperature is 65°C. The data are limited at this temperature.

Technical data Based on normal circumstances. For selection see page 5. The max. allowable discharge outlet temperature is 65°C. The data are limited at this temperature.

Based on normal circumstances (see page 5). Only for electric heating. The max. allowable discharge outlet temperature is 65°C. The data are limited at this temperature. The air displacement values are less when a filter module is used: IndAC S: 10% and IndAC M: 15 %.

Explanation of technical data Heating capacity correction coefficients The heating capacity of the battery type W1 represented in the tables on page 10 is based on a water range of 90/70ºC. The heating capacity of battery type W2 is based on a water range of 80/60ºC and of W3 on 60/40°C. The heating capacity of the battery type W1 represented in the tables on page 11 is based on a water range of 120/100°C and W3 is based on 80/60°C. An air inlet temperature of +15ºC has been assumed. When other water temperatures and/or air inlet temperatures are used, the heating capacity is to be...