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A simpler way to seal off the mirror is to use canister caps . They look like shower caps and are available at kitchen section in supermarkets. I have a GSO 8 inch F6 tube assembly on an eq. mount and i fitted a 80 mm. box fan from Dick Smith. To increase air flow around the mirror I drilled a series of 10mm closely spaced holes between the collimation screws. Choosing the largest of the caps I cut a clearance hole for the fan , then I cut the elastic from a small cap and glued and taped it to the centre of the large one. With large cap around tube and the small cap around fan this seals off the tube nicely forcing the air around the mirror and up the the tube. The fan was driven by 8 AAA battery pack. Doug Mac.
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