RedTrev

Hi,

When an electric motor is switched off transient voltages can be seen, sometimes in the order of +/- 250v. These transients can do damage to electronic equipment such as Engine Control Modules or other ECU's unless they are fitted with front end supression. Some SPAL fans have transient spike suppression built into them and others don't. They are quite popular for heater units (we use them here at my place of work - LTI vehicles -we make the black cab you get into on a Friday and Saturday night!) I suggest you add a suppression device to your fan to "iron" out these spikes before you start to see things fail. Try a V22ZA1 which is a varistor available from RS or somewhere similar. (RS part number 649-122 ... they cost pennies)

This may not stop overrun but it'll protect your electronic bits if any fitted! Fit it in parallel across the fan.

Trev

V22ZA1

Hi. I bought the roof insulation board (expanded foam & foil sided) from B+Q. It is approx 1.5 inches thick and came in a 8'x4' sheet for about £16.

Trev

These people have quite a range of latches:

http://www.protex.com/latch.asp

(this is my first posting, hope it works!)

This one looks secure:

37-2099