It is specially designed for optimal climate, with accurate open and close, can regulate air flow and ventilation level in house by advance climate control. Maintenance free with no additional operation cost.
FEATURES
1 The sidewall inlets are made of high standard ABS plastic material, with UV stabilized added to ensure strong anti-aging function with long lifespan.
2 Special design shape of inlets offers excellent sealing the building airtight.
3 Steel parts are made of stainless steel...