This is the enclosure kit only for a 12 x 26 Super Max Canopy
, so it would not have a snow load rating. The 12 x 26 Super Max itself does not have a snow load rating, either, and the manufacturer recommends that you keep the canopy free of snow.
You may be interested in the Shelterlogic 12 x 25 x 11 ShelterTube Snow Load Rated Shelter
, which does have a snow load rating of up to 43 pounds per square foot when properly deployed and anchored.