The hole diameter required is 6.7". The ventilator consists of a telescoping air duct that can be adjusted from 11.02"-18.5" to adapt to multiple wall thicknesses.
Canarm, SINGLE PIPE ERV, ENERGY RECOVERY VENTILATOR, Drive Type Direct, Fan Diameter 9.43 in, Air Delivery 29 cfm, Model# GC30ERV-W

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- High thermal efficiency. Built-in high-tech ceramic energy regenerator with maximum heat recovery efficiency of up to 90%
- Includes F7 (MERV11) filter and pre-filter to keep air clean.
- Energy efficient, reversible, 3 speed EC motor.
- Units can work individually or in paired master-slave setups.
- One unit can ventilate a room up to 500 sqft.
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