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The heater actually blows across the laser beam. Any idea as to the "typical" duration of the flicker one could expect (our last from a few miiliseconds right up to a second or two).

We are attempting to use a class 2 laser photoelectric detector over an outdoor distance of 300 feet (through beam detection). We get a lot of short (one to several milliseconds) detector operations whenever a nearby warm air heater is on. Any idea as to the cause?