NMB ( Model# 1611KL-04W-B59 ): 40x40x28mm fan for Router, 1U and Blade Servers 1611KLRegular price: $15.00Sale price: $12.00 NMB ( Model# 1611KL-04W-B59 ): 40x40x28mm fan for Router, 1U and Blade ServersA popular 40x40x28mm cooling fan for 1U and Blade servers. Fan guard is built-in with 12-inch cable and 3-pin sensor connector (to your server board or device to mount this fan - depending on your chassis.)