Easy to install, looks very nice
UPDATE: The unit has been working for two weeks, and not only performs as advertised,  it performs better than we expected.  We are sensitive to mold spores and other allergens, to the point that we can begin choking & coughing within 1 minute of walking into any environment with these in the air.  We both stopped coughing and choking within 1 day of installation, and now it only happens when we actually LEAVE the house!  Our inside air is no longer causing us breathing problems.  I'm raising my rating to 5 stars because of this observation.  GREAT PRODUCT!<br />Original rating - 4 stars:<br />Bought this to combat COVID. Order fulfillment,, shipping,, delivery, and packaging are outstanding. Installed today on the output duct just above the plenum so it can kill any fungus and bacteria that forms on the exchanger - especially in air conditioning season.<br /> 1st thing I noticed is that the template included in the package is the incorrect size for the unit. If used, the unit will NOT assemble to the furnace.  I made another template, adding only 10 minutes to the installation time. 2nd thing I noticed is that the Phillips head screws included in the package are poor thread quality, and the wrong size.  The heads don't fit into the keyhole because they're too big.  The difference between the thread size and the shank diameter is too small, so once they've gone into the hole, they just spin and won't tighten. I used heavier threaded HVAC hex-head screws I had on hand, and they held just fine.  Third thing I noticed is the electrical plug on the power cord sticks straight out into the walkway. Just a minor irritant for now, but I'll have to cut it off and replace it with a right-angle plug before the wife catches it with the laundry basket and pulls it out of the receptacle!  4th thing I noticed is the two green LEDs are labeled Right and Left, but the lamps are Upper and Lower, not right and left.  Also, there's no way to identify which bulb belongs to which LED - I certainly won't look to see, because it'll burn out my eyeballs!  5th thing I noted is that the lower lamp socket appears to have been assembled upside down.  If the locking mechanism ever fails, the bulb will easily fall into the duct because there is no support for it other than the pin lock.  If the upper one fails, the socket walls look like they'll still hold the bulb in place.<br />Overall, this unit is SUPER easy to install.  Total time from unboxing to installation completed was less than 45 minutes, including the making of a new template and getting replacement screws.  I'll update this review based on its performance at a later date, probably about 3 - 6 months from now.
Rating: 5 stars