Does a higher fire rating mean a more expensive fireproof cabinet?

Yes, generally. A 2-hour fireproof cabinet contains more insulating material and uses thicker walls than a 1-hour model, making it heavier and more expensive. A 3-hour model is more expensive still. The price premium for a 2-hour vs. 1-hour rating is typically 25–50%. Media-rated cabinets (Class 125 or 150) are significantly more expensive than paper-rated (Class 350) cabinets of the same size because achieving lower interior temperatures requires much more insulation. OfficeFurniture2go.com — call 1-800-460-0858 for current pricing.