Lynden Door FineLine Interior Doors

The FineLine series delivers contemporary MDF doors with distinctive beveled grooves designed for clean, modern aesthetics. These doors feature smooth, bevel-grooved MDF surfaces with grooves approximately 0.22” wide and 0.04” deep, creating sharp linear patterns that paint beautifully.

Built for commercial and residential projects, FineLine doors come in hollow core, solid core, ventilated core, and fire-rated configurations (20, 45, 60, 90-minute ratings). The MDF construction provides consistent paintability without the grain telegraphing issues common with natural wood doors.

Size and Configuration Flexibility

FineLine doors accommodate real-world installation needs with practical sizing options:

Specification	Options
Heights	6’8”, 7’0”, 8’0”
Widths	2’0” to 4’0” (standard), up to 4’8” (special order)
Thickness	1-3/8” and 1-3/4”
Stile Width	6-inch (accommodates standard door hardware)
Bottom Rail	10-inch tall (ADA compliant, allows for field trimming)

The doors can be configured as bifold doors, expanding their use for closets and room dividers. Trimmable up to 1-inch on each end (top/bottom) thanks to wide rails, contractors get needed flexibility for tight openings without compromising structural integrity.

Fire Rating and Commercial Applications

FineLine doors meet strict fire rating requirements with 20-minute Category A/B and 45-, 60-, 90-minute Category A options. This positions them perfectly for healthcare facilities, schools, and multi-family housing where code compliance drives door selection.

The ventilated core option (for airflow) solves HVAC balance issues in commercial buildings — no more propping doors open to equalize pressure. Air flows in from one side, through the door core and out the opposing side, maintaining fire separation while allowing return air movement.

LEED-compliant options available and FSC certification available upon request check the boxes for green building projects. Applications include residential (single-family, multi-family, hospitality) and commercial (healthcare, education, retail, office/tenant improvement).

The Bottom Line on FineLine

Compared to traditional molded doors, FineLine provides a cleaner, more contemporary look with sharp beveled lines rather than raised panels. The MDF substrate takes paint uniformly — critical for achieving consistent sheen across door faces in high-visibility commercial applications.

The 1-year limited warranty covers manufacturing defects and handling under standard Lynden Door warranty guidelines. FineLine is compatible with StileLine®, ReDiscovery, FineLine, wood veneers, Elemental, prefinished and primed hardboard door styles, allowing architects to maintain consistent hardware prep across different door aesthetics within the same project.

For contractors tired of callbacks from warped six-panel doors or paint adhesion failures on cheap molded options, FineLine offers predictable performance. The groove profile stays crisp, the MDF stays stable, and the paint job looks professional years later.

Frequently Asked Questions

Q: What door thicknesses does Lynden Door FineLine come in?

Lynden Door FineLine doors are available in 1-3/8” and 1-3/4” thicknesses. Both thickness options come with the same bevel-grooved MDF surface design and are compatible with standard door hardware.

Q: Can FineLine doors be trimmed to fit during installation?

Yes, Lynden Door FineLine doors can be trimmed up to 1 inch on each end (top and bottom) thanks to their 10-inch tall bottom rail. The 6-inch stiles and wide rails maintain structural integrity even after field trimming.

Q: What fire ratings are available for Lynden Door FineLine?

Lynden Door FineLine offers fire-rated core options including 20-minute Category A/B and 45-, 60-, and 90-minute Category A ratings. These fire-rated options make FineLine suitable for healthcare facilities, schools, and multi-family housing where code compliance is required.

Q: Does Lynden Door offer ventilated FineLine doors for HVAC applications?

Yes, Lynden Door FineLine includes a ventilated core option where air flows in from one side, through the door core, and out the opposing side. This design maintains fire separation while allowing return air movement in commercial buildings.

Q: What’s the warranty on Lynden Door FineLine doors?

Lynden Door FineLine comes with a 1-year limited interior warranty that covers manufacturing defects and handling under standard Lynden Door warranty guidelines.

Q: What are the groove dimensions on FineLine doors?

The bevel-groove profile on Lynden Door FineLine measures approximately 0.22” wide and 0.04” deep. These grooves create sharp linear patterns on the smooth MDF surface that take paint uniformly.