Curved vs straight fan blades
I'm about to buy Spal fans and wanted to know if there is a difference beteween the blades.
Straight
http://cgi.ebay.com/ebaymotors/Spal-12-Pull-Fan-_W0QQcmdZViewItemQQhashZitem19bbc145c6QQitemZ110524188102QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
OR curved
http://cgi.ebay.com/ebaymotors/12-SPAL-MID-PERFORMANCE-ELETRIC-PULLER-FAN-30100467-_W0QQcmdZViewItemQQhashZitem563d8bf650QQitemZ370399770192QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
Straight
http://cgi.ebay.com/ebaymotors/Spal-12-Pull-Fan-_W0QQcmdZViewItemQQhashZitem19bbc145c6QQitemZ110524188102QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
OR curved
http://cgi.ebay.com/ebaymotors/12-SPAL-MID-PERFORMANCE-ELETRIC-PULLER-FAN-30100467-_W0QQcmdZViewItemQQhashZitem563d8bf650QQitemZ370399770192QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories