Lynden Door CD200 Commercial Series: 20-Minute Fire-Rated Particleboard Door

The CD200 delivers what commercial contractors need most: a 20-minute fire-rated door that meets both positive and neutral pressure requirements while achieving Extra Heavy Duty ratings when properly blocked. Particleboard core meeting ANSI A208.1 LD1 provides the density required for hardware retention without the weight penalty of mineral core alternatives.

Fire Rating and Code Compliance

20-minute fire rating with both positive and neutral pressure options gives contractors flexibility across different jurisdictions. Maximum door size varies by pressure requirement — 4’ x 9’ for positive pressure applications, with neutral pressure configurations allowing either 4’ x 9’ or 3’ x 10’ for taller openings.

Fire Rating Specifications	Value
Fire Rating	20-Minute (Positive or Neutral pressure)
Maximum Size (Positive)	4’ x 9’ (1219 x 2743 mm)
Maximum Size (Neutral)	4’ x 9’ or 3’ x 10’ (914 x 3048 mm)
Thickness Options	1-3/4” (45 mm) - Standard Fire-rated
Compliance Standards	UBC 7-2 1997, UL 10C, NFPA 252

The door meets critical fire code requirements through UBC 7-2 1997, UL 10C, and NFPA 252 compliance. Thickness options range from 1-3/8” for non-rated applications up to 2-1/2”, though the standard fire-rated configuration runs 1-3/4” (45 mm).

Construction and Durability Ratings

The CD200 achieves WDMA IS-1A Extra Heavy Duty rating when blocked — the highest classification for commercial door durability. AWS Extra Heavy Duty rating when blocked provides additional assurance for high-traffic installations. These ratings matter in Montana’s government buildings and medical facilities where door cycles exceed residential use by orders of magnitude.

Factory-machined hardware prep is recommended to maintain warranty and fire-label integrity. Specific blocking (WDMA HB-1 to HB-8) should be specified for surface-applied hardware to avoid through-bolting, which compromises both the fire rating and structural integrity.

Acoustic Performance for Commercial Applications

Sound control becomes critical in Montana hospitals and schools. The CD200 achieves STC 32 as an operable rating with specific door-bottom seal systems. Compatible seal systems include NGP 5075/5060/335S or Pemko S773/S44/PDB 411 AE — contractors need to specify these exact models during ordering to hit the acoustic target.

Face Options and Finishes

HPVA ‘A’-grade wood veneer comes standard, suitable for most commercial applications. Paint-grade options include MDO, HDF (PC-3), and Hardboard (HB) for projects requiring field finishing. Plastic laminate faces handle high-abuse corridors where cleanability trumps aesthetics.

The door uses Type 1 adhesives with No Added Urea-Formaldehyde (NAUF) options, meeting TSCA Title VI requirements for indoor air quality — increasingly specified in Montana schools and healthcare facilities.

Applications and Warranty

Typical applications span hotels, office towers, schools, hospitals, government buildings, and high-traffic corridors. The 5-year limited interior warranty covers the fire-rated version, while non-rated versions typically carry 2-year coverage.

Installations must follow NFPA 80 standards for fire doors and frames. Vision-lite openings require fire-rated glazing to maintain the assembly rating.

FAQ

How does the CD200 compare to hollow-core alternatives? The CD100 hollow-core alternative is lighter and less durable, typically non-rated for fire. The particleboard core provides superior screw retention and impact resistance required for commercial traffic.

What certifications does the CD200 carry? Indoor Advantage Gold (SCS Global Services), CDPH/EHLB Standard Method (CA 01350) v1.2-2017, optional FSC Chain-of-Custody, TSCA Title VI compliance, and 20-minute fire rating in Category A or B.

Can the door achieve higher STC ratings? The STC 32 rating requires specific seal systems. Higher ratings would require different core construction or the CD350 with Structural Composite Lumber core.

What’s the difference between positive and neutral pressure ratings? Positive pressure testing simulates fire conditions pushing against the door. Neutral pressure represents balanced conditions. Different jurisdictions require different test methods, making the dual rating valuable for contractors working across county lines.