Thank you very much! But when i reversed faces in 3dsmax, all visible faces turned to unclosed ones and all unclosed faces turned to visible. For now, just one solution that i’ve found, re-modeling the walls 
Thank you very much! But when i reversed faces in 3dsmax, all visible faces turned to unclosed ones and all unclosed faces turned to visible. For now, just one solution that i’ve found, re-modeling the walls