I have a generic outdoor enclosure with a heater and blower. How close should the lens be from the enclosure glass? Should it be nearly touching the glass or does there need to be a gap to circulate air when there moisture condenses on the glass? The heater block sits about 1" from the glass.
[background: The enclosure is mounted under an eve and is protected from the sun, however, this is the midwest with below freezing temps]