The top sheet metal is a solid sheet metal. You can see, very badly, through the fan.

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Removing the top panel: ok. To do a short test, it is a solution but in operation it is not reasonable, if only because it strongly modifies the path of the ventilation (airing). Without the cover, the air no longer comes from above by licking the filament seals and Eimac recommends.

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Maybe some have cut a small window blocked by a sieve and a plexiglass plate

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Eimac Technical data

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