Lynden Door

Lynden Door manufactures interior doors with specific performance ratings that contractors need. Their product lines include fire-rated options from 20 to 90 minutes, acoustic-rated doors with STC ratings up to 35, and core construction choices ranging from hollow to mineral cores. As a third-generation, family-owned manufacturer, they produce residential, commercial, and architectural interior wood doors.

Fire Ratings and Acoustic Performance Across Product Lines

The technical specifications matter more than the marketing fluff. Lynden Door offers fire ratings of 20, 45, 60, and 90 minutes across multiple product lines, with different core materials engineered for each rating level.

For acoustic performance, the numbers tell the story:

Door Series	STC Rating	OITC Rating	Core Type
IC200	32	30	Particleboard
CD350	35	31	Bonded core
IC350	35	Not specified	SCL core

Their VanAir ventilated doors provide airflow while still achieving STC ratings up to 25. That’s the balance between ventilation requirements and sound control that actually works in commercial applications.

The fire-rated options break down by series:

• CD600 series: 60-minute rating with mineral core construction
• IC series: 20-minute ratings available at 1-3/4” thickness
• P20 particleboard: 20-minute rating at competitive pricing

Core Construction and Warranty Structure

Different cores serve different purposes. Here’s what’s actually available:

Core Type	Fire Rating	Typical Application	Warranty
Hollow (H8/H4)	Non-rated	Budget residential	1-year limited
Particleboard (P8/P4)	Non-rated	Standard residential	1-year limited
Particleboard (P20)	20-minute	Commercial/multi-family	Lifetime limited
SCL	20-minute available	High-performance	Lifetime limited
Mineral	Up to 90-minute	Maximum fire protection	Varies by series

The warranty structure follows a clear pattern. Architectural LD series gets lifetime limited warranty, Commercial CD and Interior Commercial IC series get 5-year limited, and Standard Construction series gets 1-year limited. You pay for longevity.

SCL cores offer superior screw-holding and moisture resistance — practical benefits for Montana’s freeze-thaw cycles. Particleboard cores provide solid feel and sound dampening at lower cost points. Hollow cores remain the budget option for residential passage doors where performance isn’t critical.

Modern Collections: StileLine and Elemental

The StileLine and Elemental collections target different aesthetics with substantive technical backing.

StileLine features European-inspired “sketch-face” wood-veneer design with asymmetrical styling and opposing-grain horizontal patterns with vertical stiles. Available veneers include African Mahogany (quarter-sawn), White Maple (plain-sliced), White Oak (rift-cut), and Black Walnut (quarter-sawn). Each door shows unique wood-grain patterns due to natural veneer.

The Elemental collection uses smooth, bevel-grooved MDF surfaces with core options ranging from hollow to 90-minute fire-rated. Construction details include 6-inch stiles for standard hardware mounting and 10-inch bottom rails that are ADA compliant and allow field trimming. The bevel groove profile measures approximately 0.22” wide and 0.04” deep.

Both collections accommodate serious performance requirements. Available in thicknesses of 1-3/8” and 1-3/4”, with fire ratings from non-rated to 90 minutes depending on core selection. Maximum door size reaches 4’ x 8’ with custom widths available by special order.

Custom factory machining and finishing are available — critical for commercial projects where field modification isn’t practical. Applications include multi-family residential where developers want differentiation without breaking budgets, custom homes, commercial/institutional interiors including hotels and healthcare facilities, and sound-attenuated or fire-rated environments.

The real value in these collections? They bridge the gap between commodity hollow-core doors and high-end architectural millwork. You get modern aesthetics with legitimate performance ratings at price points that work for spec projects.

FAQ

What fire ratings does Lynden Door actually offer?

Lynden Door provides fire ratings of 20, 45, 60, and 90 minutes across their product lines. The CD600 series achieves 60-minute ratings with mineral core construction, while the P20 particleboard core delivers 20-minute ratings at more competitive pricing. Fire ratings vary by core type — hollow cores are non-rated, while particleboard, SCL, and mineral cores can achieve various fire ratings from 20 to 90 minutes.

How do the acoustic ratings compare between door series?

The IC200 series achieves STC 32 with OITC 30, while both the CD350 and IC350 series reach STC 35. The CD350 also provides OITC 31 rating. Even their VanAir ventilated doors maintain sound control with STC ratings up to 25 while allowing airflow. Higher STC numbers mean better sound blocking — STC 35 is sufficient for most commercial applications.

What’s the difference between their warranty levels?

Lynden Door offers three warranty tiers: Architectural LD series gets lifetime limited warranty, Commercial CD and Interior Commercial IC series get 5-year limited warranty, and Standard Construction series gets 1-year limited warranty. Fire-rated cores with particleboard, SCL, Agfiber, or stave lumber construction receive lifetime limited warranties, while non-rated hollow and standard particleboard cores get 1-year coverage.

Which core type works best for Montana’s climate?

SCL cores offer superior moisture resistance and screw-holding power — both critical for Montana’s freeze-thaw cycles and temperature swings. Particleboard cores provide good sound dampening and solid feel at lower costs but are more susceptible to moisture damage. Hollow cores should be limited to interior applications where moisture and temperature are controlled.

Can these doors be trimmed in the field?

Elemental collection doors feature 10-inch bottom rails specifically designed to allow field trimming while maintaining ADA compliance. StileLine doors can be trimmed up to 1” to 1-1/4” on each end, with top and bottom rails being 2” wide. Always verify specific trimming allowances for fire-rated doors, as excessive trimming can void the rating.