Supply and exhaust ventilation 150diameter.

[Jensa1]

Where can I buy good supply and exhaust air vents with a 150 diameter? It will be for a 15 sqm garden shed with a sauna in half of it.

 

[Edit_Kräpp]

If you only need damper blade valves, they can be found in most home improvement stores, building supply stores, etc. If you need a proper unit for adjustment, the tip is to go to the ventilation company.