My solution was to use a piece of cardboard with holes cut to accommodate the ceramic heat lamp that sits over the screen top (I have a dual-domed lamp to better control ambient temps cage-wide with independent dimmer switches, but it doesn't matter), as well as holes cut on one side of the top for ventilation. The heat lamps act as ventilation "motors" as they draw air up through the 3/4" inch border around their cut-out hole. Air gets "sucked in" through the ventilation holes on the left side in the process. I've had it in use for over a year, and my bp is doing great. The cardboard top is wrapped in heat tape. The concept was suggested by someone else in the forum, who had a piece of lexan machine-cut at a plastics shop for the holes. It was a bit of work, but well worth it
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