Prime Doors Supply offers Class E 30-minute internal fire doors with horizontal grooves, made from masonite. These fire-retardant MDF doors are a budget-friendly option for private housing and commercial projects. With a minimalistic flush panel design, they can be painted to match any space. Certified to SANS 1253 and audited by FIRELAB, they provide 30-minute fire resistance and are a cost-effective, multi-purpose solution.