The lithonia lighting co. has built up a name and done the worst thing you can do, and that is reduce the quality of the product. The fixtures were flimsey and falling apart right out of the box and the flanges are not part of the fixture they come seperate and must be assembled but have no way of attaching safely to the fixture. The troffers did not have the adjustible arms on the sides as pictured so they had to be fastened using another inferior method. Conclusion, would have been better to use a less expensive fixture with those goofy ready to assemble flanges and put it together that way to offset the extensive labor COST for assembly & installation.