NVT ESG4BR
4″ White Energy Saver Back Draft Grille – White

The Energy Saver grille is silent and effective back draft grille. It’s clever design allows air to pass freely to the outside world while preventing unwanted drafts. It also limits the negative effects on extractor fans caused by long ducting or air blow backs.
It is simple to fit and is available in White or Brown and in 4″ and 6″ sizes.