The Lynden Door H4 delivers factory precision machining and multiple surface finishes in a standard 1-3/4” hollow core door. Built for volume interior installations where lightweight handling matters as much as clean aesthetics, this door serves commercial contractors and residential builders who need reliable passage doors without the weight penalty of solid core options.
Factory Machining and Hardware Prep
Automated precision machining for hardware preparations sets the H4 apart from field-prepped doors. The factory handles hinge prep, bore prep for locksets, and even optional vision-lite and louver cutouts. That’s hours saved per door on large projects — no measuring, no templates, no risk of misaligned hardware.
The machining precision matters most on commercial jobs where consistency across dozens of doors affects both appearance and function. Factory machining available for hinges, locks, and closers means every door arrives ready to hang. No jobsite drilling. No metal shavings in finished corridors.
Surface Finish Options
The H4 accommodates project specs without custom orders through four distinct face options:
| Surface Type | Options | Best For |
|---|---|---|
| Wood Veneer | Various species | Stain-grade projects |
| Prefinished Hardboard | Smooth, Textured, Embossed | Paint-ready commercial |
| Primed Hardboard | Ready for field painting | Color-matched installations |
| Molded Profile | Flat Panel, Raised Panel | Traditional residential |
High-quality factory stain and paint options available eliminate another field step. The factory finish beats anything applied on a dusty jobsite. Multiple surface finishes: smooth, textured, or embossed let contractors match existing doors or create visual hierarchy between spaces.
Applications and Specifications
At 1-3/4 inches (approx. 44mm) thick, the H4 fits standard commercial and residential frames. The hollow core (cellular or drop-in/loose-lay) construction keeps weight manageable — critical when installers hang 50+ doors in a day.
| Specification | Value |
|---|---|
| Core Type | Hollow Core (Cellular or Drop-in/Loose-lay) |
| Thickness | 1-3/4 inches (approx. 44mm) |
| Fire Rating | Non-rated |
| Acoustic Performance | Typically low (estimated STC 20-25) |
| Edge Options | Square or beveled edges |
Primary applications include interior passage doors, bifold doors, and light-commercial buildings. The lightweight construction shines in commercial interior offices and hallways (where non-rated).
Installation Requirements
Acclimatize doors to building heat and humidity before installation — especially critical in Montana’s dry winters when indoor humidity drops below 20%. Seal/finish all six surfaces (sides, top, bottom, and edges) to maintain warranty. That includes the often-forgotten top and bottom edges where moisture infiltration starts.
Standard installation tools required: hammer, level, screwdriver, plumb line. Nothing specialized. Retrofit installations may require a handsaw for trimming when matching existing openings.
Environmental Compliance
The H4 meets CARB Phase II and TSCA Title VI compliant standards for formaldehyde emissions. SCS Indoor Advantage Gold (Gold certified for indoor air quality) certification matters for schools, healthcare facilities, and green building projects.
The Bottom Line
The H4 works for contractors who value installation speed over acoustic performance. Factory machining eliminates field prep errors. Multiple surface options mean matching existing doors without custom orders. At an estimated STC 20-25, it won’t block sound between offices. But for general circulation spaces, storage rooms, and residential bedrooms where privacy isn’t paramount, the weight savings and clean factory prep justify the hollow core trade-off.
One (1) Year warranty coverage for manufacturing defects and structural integrity under standard interior conditions. Not the longest in the industry, but adequate for a hollow core door meeting its intended use.
FAQ
What’s the actual thickness of the H4 door? 1-3/4 inches (approx. 44mm). This is the standard commercial door thickness that fits most pre-hung frames and existing openings.
Can the H4 be fire-rated? No. The H4 is non-rated. Fire-rated 20-minute option available as P20 if you need fire ratings.
What hardware prep options are available? Automated precision machining for hardware preparations covers hinges, locksets, and closers. Factory machining available for all standard hardware configurations.
How does the H4 compare to other Lynden Door models? The H8 model: 1-3/8” Hollow Core; thinner and lighter than H4. The P4 model: 1-3/4” Particleboard Core; identical thickness but denser, providing better sound insulation.
What finishes can I get from the factory? Wood Veneer (various species), Prefinished Hardboard (Smooth, Textured, Embossed), Primed Hardboard, Molded Profile (Flat Panel, Raised Panel). High-quality factory stain and paint options available.
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