Bathroom extractor fan backdraught shutters

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I have recently refurbished my bathroom. When doing so I installed a bathroom extract fan wall mounted. It's in solid ducting through the wall

I got a envirovent silent 100T fan. Very impressed. Low wattage. Good extract rate. Quiet for a wall mounted fan. The only thing that bothers me is the backdraught shutter is a rubbish thin film of plastic. On the outside I've put a no resist fan grille. Should I put an inline backdraught shutter or leave as it is?

The grille is suppose to not affect fan efficiency. It's like a cowl but without a flap at the bottom. It's just open at the bottom. I'm more concerned when it gets to winter of a lot of wasted heat loss in the bathroom. I got an inline shutter gravity flap, not a spring one and when testing the fan the shutter only opened a slight bit. Now my options are to remove the rubbish plastic shutter and install the inline one in the middle of the solid ducting. Or to install the inline one as well as the plastic film one or to leave it and see how I go. Anyone any experience with bathroom extract fans and backdraught shutters?
 

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The gravity flaps, spring flaps etc are all a bit rubbish- noisy in windy weather is my main complaint along with draughty when there's no need for extra ventilation (shower/whatever long finished).
There are many with powered shutters, pick one- you won't regret it
 
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the plastic film butterfly flaps do seem to work, and are very quiet.

I mostly use cowl vents, which do not rattle, but can sometimes bang depending on winf direction.
 
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