Can wood doors achieve 180-minute fire ratings?
No. Wood door construction is generally limited to 20-minute, 45-minute, 60-minute, and 90-minute fire ratings. Where 180-minute ratings are required by code, hollow metal door assemblies are specified. Fire-rated assemblies are available in all five rating levels (20, 45, 60, 90, and 180 minutes), but the 180-minute level requires hollow metal construction.
Which material is appropriate for exterior commercial doors?
Hollow metal is the standard material for exterior commercial door openings. Steel construction provides weather resistance, security, and dimensional stability that wood cannot match in exterior exposure. Galvanized or primed-and-painted hollow metal doors resist moisture, temperature cycling, and physical abuse from exterior use.
Are hollow metal doors more expensive than wood doors?
Initial unit cost for hollow metal doors is generally higher than standard wood doors. However, total cost of ownership favors hollow metal in high-traffic and high-abuse applications due to longer service life and lower maintenance requirements. The cost comparison depends on the specific application, required fire rating, and expected traffic level. Wood doors requiring a fire rating of 45 minutes or longer are more expensive than hollow metal doors carrying the same fire rating.
Can wood doors be installed in hollow metal frames?
Yes. Wood doors installed in hollow metal frames is the most common configuration in commercial construction. The hollow metal frame provides durability and fire rating capability while the wood door provides the desired interior finish. This combination is standard for office, healthcare, and hospitality applications.
How does CDF help specify the correct door material?
CDF distributes both hollow metal and wood doors. ProBuilder allows contractors and facility managers to configure either material for any opening, with compatible frame and hardware options displayed automatically. ProBuilder filters options based on the required fire rating, ensuring the configured assembly meets code requirements.