Here's that elusive part number for Kubota's B3350 cover that sheepfarmer mentions in the above quote:Nice! I had heard that Kubota offered a grille cover for the B3350 which has difficulty making enough heat to complete a regeneration in cold weather. Some of us with front snowblowers have had trouble with snow getting in the air filter. I came up with a very primitive solution that keeps snow out of the air filter and stops ice from covering the radiator. Life is much easier with it. Corner of an old fitted bedsheet held in place with magnets. Not near as nice as yours! I am usually blowing snow at 10 to 20 F, I was more worried about overheating, but it runs at a steady 3 bars. I'll add a picture. I also put a plastic bag over the brush guard.
Kubota part # 77700-06480 Mask, B3350 (Kubota's description)
It covers the front grill opening only. It does not cover the sides of the hood.