Diary & Notes ~ Air Cell Detatched SHIPPED Chicken Eggs for incubation and hatching

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Last hatch I had trouble with air cells not growing to where it was supposed to be at day 18 . the humidity was kept at 35 then.so this time around today day 17 I keep humidity at 20-25. I checked them and again air cells too small. What can I do to get it right? Haven't heard of less humidity during the first 18 days. Any suggestions? Tomorrow is lock down and I don't think air cells would grow in 24 hours.
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It my opinion the fan should blow to the front. The single fan used in GQF incubators are the same type I use. They are a commercial fan used primarily in refrigeration and require a motor mount or bracket.. The fan motor is sealed and unaffected by dust or humidity. Standard rpm is around 1500. This is important because it is better to move a large volume of air at a lower velocity. The CFM or cubic feet per minute using this type fan is determined by the size of fan blade. Understand that the cfm is referring to a free air measurement, and in the confines of a cabinet the actual cfm is lower. The fan can only push as much air as it can pull. Make sure you design the cabinet with ample clearances for the air to flow. This gives you uniform temp all around. I have experience building and testing many incubators, but it doesn't hurt to experiment and try something new. I'm not claiming to know it all. The fan motors power is rated by watts. The wattage required is determined by the size and pitch of the fan blade you want. Example the single fan sportsman has a 7" 30 deg pitch- five blade fan rated between 200-300 cfms and would require a minimum 4 or 5 watt motor. Some manufactures refer to wattage in factional horsepower . You can use dual axial type fan with the coil wire heat elements. Its hard to find lower speed axial fans that work well in a sportsman sized incubator. I use them in smaller cabinets. You can use high speeds fans if it is only a setter and your not hatching in it . The high speed fans (3000 rpm) are very noisy. Sorry if I long winded.
Thank you so much for that explanation!

that is a powerful fan, so its worth it to simply purchase this from GQF Cabinet model fan assembly for cabinet model incubators. Includes motor, fan blade and mounting bracket.

Price $49.97 ? Plus it needs to not MELT if I am using the the heat spring type element!
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https://www.gqfmfg.com/store/comersus_viewItem.asp?idProduct=112

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