Product review (4 stars): Brilliant design!
We bought a Kenmore (Same as Whirlpool/Maytag) 8.8 CuFt dryer with a "Side vent".
Space is a minimum in this installation.
The "Conquistador Helmet" style elbow tales approximately 6.25 inches for a side by side install.
The Builder's Best took 4.25", a lifesaver in this case.
The only reason I did not rate this as a 5...or even 6/7 STAR is...
I needed an extension and a couple of duct clamps to complete the install...
Because there was not enough factory installed duct from the dryer, to clamp the offset vent to.
I am not sure what the rear vent option would have provided,
But, save a last minute trip to the hardware store, pick up an extension, and return it if not needed.
Highly Recommended!