I have a few of these. They are high quality aluminum housed squirrel cage fans. Made by Philips. 110v. Mount with 4 direct face mounting holes. They are 3/16" and sit at 2-1/2" x 11-1/*4".  See pictures for overall dimensions. These are new old stock. Some have a little surface rust on the motor but no effect on working condition. Tested. Discount for quantities. Combined shipping discount. Feel free to ask any questions.