Description Ram Bug Barriers are fine screen mesh filter for intake fans that are highly effective at stopping pests from penetrating growing areas. Available in all sizes to fit our range of growroom fans from 100m to 315mm, the RAM Bug Barriers attach to the side of the fan with Velcro. This allows for a very adjustable, tight fit to make sure bugs can’t sneak in through any small gaps. Check the filters regularly to keep them free of debris and use a plant health product/bug repellent such as Cannacure to keep plants healthy and bug-free.