Vent fan adaptors for 25mm fan.

Update 2. I ended up using a 1"id hose. Part number 5643k11 from mcmaster-carr. I drilled out the holes in my part(25mm to 1in tube) with a .070 drill and my 2-56 screws PN 90272A088 screwed right into it. I drilled the hole pattern in lexan with a 2.5mm drill for the screws and I used a 3/4" drill to hog out the hole to slightly less than 1" so I didn't need the 25mm to 1in hole adaptor. Vent fan is 3cfm and seems to blow through 10ft of hose with little problem. If I wanted more flow I could probabaly put one on the other end and have it suck air out. When my printer is fully enclosed I think that is all I'll need to vent the printer and keep the office fume free. I didn't need a hose clamp.

One part is to adapt a 25mm square fan to a 1" hole. It's expensive to find a 24.5 mm drill(the hole size for a 25mm fan), and 1" is larger than 25 mm so you would have air leaking. If you want to mount a 25mm fan to a 1" hole with almost no leaks, use this adaptor.

Another part is to adapt a 25mm square fan to blow air into or suck air out of a 1/2" id(inner diameter) hose(you may need to do both depending on length and curves in hose). Use a hose clamp to secure the hose. You would need 2-54 screws and nuts

Another part is to adapt a 25mm square fan to blow air into or suck air out of a 3/4" id(inner diameter) hose(you may need to do both depending on length and curves in hose). Use a hose clamp to secure the hose. you will need to drill out the 4 holes with a .070 drill then the 2-56 screws will screw right in to the plastic.

Another part is to adapt a 25mm square fan to blow air into or suck air out of a 1" id(inner diameter) hose(you may need to do both depending on length and curves in hose). Use a hose clamp to secure the hose. you will need to drill out the 4 holes with a .070 drill then the 2-56 screws will screw right in to the plastic.

Use them together or separately. Small holes are 3mm. They are arranged in a square 20mm on a side.

Update, the walls on the original files are too thin to print. I made the walls thicker and uploaded the new files and deleted the old files. 8/26/13. I didn't get much airflow from a 3 cfm fan through the 1/2" output. I'm experimenting with a 3/4" and 1" output hole.