Trickle Vent Set Inside & Out - 290mm - 2328mm²EA - White

You can use a slot port in the place of a round port The length will remain the same To calculate the port size in square inches you need to

So a Linear Slot Diffuser is an AC Vent Cover that is long and skinny and diffuses the air by manipulating the blades

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slot machine mathematics Trimvent 90 slot vent suitable for uPVC, timber & aluminium windows offers increased ventilation Fits new or refurbished windows