It is model SC5614 (same as 71020). It has a 20 HP Honda engine. The blower unit is an option that I added. It is the single stage blower and does a great job for me. It will expel chips 15-20 ft. They make a 2 stage blower which is also used with their leaf vac option. It provides greater suction in order to power a hose to suck leaves into the unit. Without the blower, chips are simply expelled on the ground behind the unit. For some reason, I can't get the Bearcat website to open to provide a link directly to the chipper/shredder. But here is a link to Bearcat: BearCat products Here is a photo of the rear without the blower. I don't think there is a good photo from that angle on the Bearcat site. Below the photo is a pdf of the options available. The first page has a great photo of the unit. Page 3 shows the leaf vac option.