HENG'S INDUSTRIES 90046-CR Vortex II Replacement Fan Kit (501.1099) | High-Power RV Vent Fan Upgrade | Easy Installation for RVs, Campers, & Trailers | White

I bought this Heng 90046-CR Replacement Vortex II Fan to upgrade the existing vent in my Aliner Sportliner camper (the smallest of the Aliner models). That vent had never had a fan and had no original wiring. From other reviews, installation videos, and Amazon Q&As, I thought the Heng unit should fit the vent but was not sure if it would run well in the severely slanted Aliner roof. I was also concerned about clearance for the fan profile when my Aliner was closed.My results were good. The Heng unit fit the existing opening, and the vent control system worked with the Heng control adapter. I pulled power from a light fixture located lower on the wall after testing the polarity of the existing two wire system (both Aliner wires were black) and that of the fan (one black wire, one white wire, but not wiring diagram provided). I surface mounted those wires on my slant ceiling in a low profile, self-adhesive cord cover and drilled a small hole in the face of the Heng to be able to route my power to the Heng wires at the back of the fan.The Heng fan runs without difficult at the roof angle of the Aliner and moves air very well. It was great for creating air movement on hot days. On cold days, with the vent closed, the unit pushes warm air back from the peak of the ceiling to recirculate it, reducing the amount of run-time for the furnace and evening the temperature throughout the living space.Unlike the vent fan models used as original equipment for the Aliner, the Heng profile does cause concern when folding the roof to its closed position. There is no question that the control handle for the vent would be smashed if it were not removed before roof closing. The removable screen which covers the fan also seems wise to relocate before closure. The fan speed control knob and other elements of the face of the fan can be bypassed if care is taken when collapsing the roof components and, so far, have not been damaged during closed-roof transport, but these parts seem at risk of eventual damage. I will probably make it a practice to remove the entire insert when it is necessary to close my roof or eventually adapt the depth of the Heng so the projections are protected in the vent cavity. If I always had a companion to assist when the roof halves are moving, I'd probably use the Heng as is and address any problems if they occur.My previous RV vent fan experience has been with professionally installed Fantastic Vent Fans (original manufacturer, not current). Given the price difference and ease of aftermarket installation (watch the videos as there are several tips which are helpful), this Heng unit compares well. I will be buying another for a flat roof camper application this coming season.

This fan is a big upgrade from the tiny vent fan that came in our RV. There weren't any installation instructions included but it is not to difficult to figure out. An extra set of hands is helpful. A couple of screws were missing to attach the fan to the brace. If the manufacturer installed them on the original vent I could have reused them. Another corner cut by Highland Ridge. The new fan moves a lot of air and works great in the shower area. It's nice that it reverses direction also. Money well spent.

Super easy install EXCEPT it is such a precise fit that I had to do modifications to factory parts on trailer. My trailer (new) had factory wimpy, loud, tiny, one direction fan motor. Read about this upgrade and ease of install. Easy to change the position of the gear (in new housing) to engage that in cover mechanism (two screws, designed for this and much appreciated). However, trying to push the new unit up into old housing after removal of old motor revealed obstruction at corners and no amount of jiggling and changing angle of insertion allowed it to seat properly. Took awhile to diagnose and resolve. The opening in roof (after removal of cover plate) is reinforced at each corner by a bracket spanning the thickness of the roof, curved (concave) to allow the new fan housing (square shape with rounded corners) to fit with very tight tolerance. Unfortunately, the little screw clips at corners of upper brackets that hold long bolts vertical projected about 1 mm each into the available space. This was enough to prevent proper seating of the new fan. So, I removed each long bolt one at a time, shaved the projecting 1 mm off each screw clip, and replaced (careful not to crush roof with too much tightening). New unit then fit perfectly and runs great. Not a fault of new fan manufacture, but no one else mentioned this issue (my trailer is a Lance).Super great mod. Noticeably noisier than Fantastic fan, but quieter than old fan and with adjustable speeds and reversible. LOVE IT!One suggestion--recommend a label for knob that raises/lowers outside vent cover that reminds us which direction to rotate for open vs close. I drew on with marker...