Edwards Signaling Blog

Ventilating Windows with a Wide Gap Magnet

Edwards Signaling 10/2/2018
Ventilating Windows with a Wide Gap Magnet


Venting sliding windows and doors using two magnets and one wide gap Sentrol switch. It is possible to obtain up to 5" (12.7 cm) ventilation with a 1-1/2" (3.81 cm) gap between the magnets and switch.


Select an Interlogix wide gap recessed switch and an additional 3/8" (0.95 cm) diameter by 1-1/2" (3.81 cm) long magnet.

Remove window from frame (see Figure 1, page 93).

Slightly over-drill vertical hole for switch in top of frame, about 5-1/2" (14 cm) from edge of frame. Coat switch with RTV mounting compound and insert in hole.

Mount magnets on inside of upper window channel toward top of channel with RTV mounting compound (Figure 1). Locate one magnet at edge of channel, red end toward edge of window. Locate other magnet with non-red end under switch - red end pointing away from other magnet.

After RTV sets (about 15 minutes), reinsert window in frame.

Attach ohmmeter to leads and test for proper switch operation. If switch "drops out" anywhere within ventilation range, move inside magnet (and switch) closer to outside edge of door or window.

Connect to alarm loop.

Instruct customer on proper use of ventilation feature. If necessary, add a window stop or mark maximum permissible opening to prevent false alarms.

Note: Sliding windows can also be vented using a surface mounted switch and magnet. Also, 1275W series switches can be used for this application.


1035W, 1145W, RTV 1905
Ventilating Windows with a Wide Gap Magnet