If you’ve ever opened a contractor quote and seen “TAS 201 compliant” or “HVHZ-approved IGU” and had no idea what was being charged for, you’re not alone. Florida door and window installations come with a vocabulary that mixes federal safety standards, state building code abbreviations, manufacturer terminology, and field jargon — and most homeowners learn it by guessing or asking afterward.

This glossary defines the 30 terms that show up most often on Florida door quotes, inspection reports, product approval certificates, and insurance forms. Built from 20+ years of explaining these terms to customers in plain English.

A

ADA Compliance. Hardware (handles, locks, thresholds) that meets the Americans with Disabilities Act standards for accessibility. ADA-compliant handles are typically lever-style (not knob), require 5 lbs of force or less to operate, and are mounted at 34-48 inches above the floor.

Annealed Glass. Standard untreated glass that breaks into large, sharp shards when broken. Not permitted in Florida shower enclosures, exterior doors, or any opening within 24 inches of a doorway. Always replaced with tempered or laminated glass during a code-compliant install.

B

Bi-fold Door. A door system that folds in half on hinges as it opens, typically used for closets or as accordion-style room dividers. Different from a sliding door (which slides on a track). See bi-fold doors vs accordion doors for the comparison.

Bypass Door. The most common sliding glass door configuration — two panels where one slides past the other, with one panel typically fixed. Different from a pocket door (which slides into the wall) or telescoping door (which has multiple stacking panels).

D

DLO (Daylight Opening). The actual area of glass visible inside the door or window frame, not including the frame itself. Important when calculating natural light or sizing replacement glass. A 36” x 80” sliding door panel typically has a DLO around 30” x 76”.

E

Egress. A code-required opening sized for emergency exit (typically a window in a bedroom). Bedroom egress windows in Florida must have a minimum opening of 5.7 sq ft, with specific minimum height (24”) and width (20”) requirements.

F

Florida Product Approval (FL Number). The Florida Building Commission’s certification that a specific door, window, or hurricane shutter has passed required testing for a specific wind zone. Every code-compliant exterior opening in Florida must carry an FL number — verifiable in the public state database.

Frameless Shower Door. A shower enclosure built without a metal frame around the glass, using thicker glass (3/8” or 1/2”) and minimal hardware. Common in modern Florida bathroom remodels. See our guide on whether 1/4 inch tempered glass works for shower doors for thickness specifics.

French Door. A swinging door with glass panes covering most of the surface, typically installed in pairs. Different from a sliding glass door (which slides) — French doors swing open. We compare them in detail in sliding glass doors vs french doors.

H

Header. The horizontal beam at the top of a door or window frame that supports the weight of the wall above. Header damage from settling or water intrusion is a common reason exterior doors stop closing properly.

HVHZ (High-Velocity Hurricane Zone). Miami-Dade and Broward counties — the only Florida jurisdictions with the strictest residential building code in the United States. HVHZ products must pass TAS 201, 202, and 203 testing. Every exterior opening in HVHZ must be impact-rated or protected by HVHZ-approved shutters. See our Florida hurricane prep guide for the full HVHZ vs. WBDR breakdown.

I

IGU (Insulated Glass Unit). Two or more glass panes separated by a spacer bar and sealed at the edges, with the cavity filled with air or argon gas. The standard for energy-efficient windows and sliding doors. Single-pane glass has been effectively obsolete in new Florida construction for over a decade.

Impact-Rated. A door or window that has passed Florida’s TAS 201, 202, and 203 testing — meaning it survives a 9-pound 2x4 fired at 50 mph (large missile test) and 9,000 cycles of pressure. Impact-rated products use laminated glass (not just tempered). The full breakdown is in impact vs non-impact sliding doors in Florida.

J

Jamb. The vertical sides of a door or window frame. The hinge jamb holds the hinges; the strike jamb holds the strike plate where the latch engages. A door that won’t close cleanly often has a misaligned jamb, not a faulty door.

L

Laminated Glass. Two panes of glass bonded with a clear polymer interlayer (typically PVB or SentryGlas). When struck, the glass cracks but the interlayer holds it together — preventing wind, water, or debris from breaching. The defining technology behind every impact-rated Florida product.

Light. Industry term for a single pane of glass within a window or door. A 6-light French door has six glass panes; a 9-light has nine. Sometimes confusing because “light” sounds like illumination but means “pane.”

Low-E Glass. Glass with a microscopic metallic coating that reflects infrared light (heat) while letting visible light through. Reduces cooling costs in Florida by 25-40% compared to clear glass. Standard on most modern impact products.

M

Mullion. A vertical or horizontal divider between glass panels in a window or door. Different from a “muntin” (which divides a single pane into smaller squares). A 3-panel sliding door has 2 mullions where panels meet.

N

NAP (Name, Address, Phone). A Google and local SEO term for the consistent business contact information across every directory and listing. Inconsistencies in NAP across listings can suppress local rankings and confuse AI search engines.

P

PGT. Short for PGT Innovations — one of the largest Florida-headquartered manufacturers of impact-rated windows and doors. Common shorthand on Florida quotes (“we’re using PGT WinGuard product line”). Other major Florida impact manufacturers include CGI, Eastern Architectural, ES Windows, Anlin, and Lawson.

Pivot Door. A door that swings on a vertical pivot point at the top and bottom (rather than side hinges). Common on commercial entrances and high-end residential. Allows much larger and heavier doors than traditional hinges support.

Pocket Door. A door that slides horizontally into a cavity inside the wall when opened, completely disappearing. Different from a bypass sliding door (which stays visible). Common in tight-space residential layouts. See sliding doors vs pocket doors.

R

Roller. The wheel assembly that allows a sliding door panel to glide along its track. The single most-replaced component on any sliding door — typical service interval is 5-10 years for residential, less for high-traffic commercial. Stainless steel rollers outlast standard steel by 2-3x in Florida coastal conditions.

Rough Opening (RO). The framed hole in the wall where a door or window will be installed, before the unit goes in. Standard exterior door rough opening for a 36”x80” door is approximately 38.5”x82.5” — slightly larger than the door itself to allow for shimming and squaring.

S

Sash. The frame holding the glass in a window or door panel. Operates as a unit — you don’t replace just the glass, you replace the entire sash assembly when most modern impact products fail.

Sidelight. A narrow window flanking a main entry door. Common in Florida home design — a center entry door with a sidelight on each side. Sidelights in HVHZ require their own impact rating or shutter protection.

Sliding Glass Door (SGD). Industry shorthand for sliding glass doors. Often appears on quotes and product specs. The standard residential configuration is “OX” (one fixed panel + one sliding panel) or “XOX” (sliding panel + fixed panel + sliding panel).

Spacer Bar. The thin metal or plastic strip that separates the two panes of glass in an Insulated Glass Unit, holding them at a consistent distance and creating the sealed cavity. Failed spacer bar seals are the #1 cause of foggy IGU glass.

T

TAS 201/202/203. The three Florida testing standards for impact products in HVHZ jurisdictions:

  • TAS 201 — Large missile impact test (the 2x4 missile test)
  • TAS 202 — Uniform static air pressure test
  • TAS 203 — Cyclic wind pressure loading

A product certified to all three is fully HVHZ-compliant. WBDR products test to similar but slightly less strict standards.

Telescoping Door. A multi-panel sliding door where panels stack behind each other when opened, allowing a wider opening than traditional bypass doors. Common in luxury Florida homes opening onto pools or patios. Significantly more expensive than standard bypass doors. See the benefits of telescoping sliding doors.

Tempered Glass. Glass that has been heat-treated to be roughly 4x stronger than annealed glass and to break into small rounded pebbles instead of sharp shards. Required by federal code (16 CFR 1201) in all shower doors, exterior doors, and any glass within 24 inches of a doorway. Different from impact glass — tempered glass alone is NOT impact-rated.

Threshold. The horizontal piece at the bottom of a door frame that the door closes against. Adjustable thresholds can be raised or lowered to perfect the seal. A door that lets cold air in often has a threshold issue, not a door issue.

Track. The rail along which a sliding door panel slides. Bottom tracks bear the door’s weight; top tracks guide the panel. Bent, dented, or salt-corroded tracks are the second most common reason sliding doors fail (after rollers).

W

WBDR (Wind-Borne Debris Region). Florida counties along the coast and within 1 mile of the coast (excluding HVHZ). WBDR includes most of Tampa Bay, Naples, Fort Myers, the Treasure Coast, and the Panhandle coast. Building code requires impact products or shutters but with somewhat lower wind pressure thresholds than HVHZ.

Weatherstripping. The flexible seal around a door or window that blocks air, water, and pests. Available as foam, rubber, vinyl, or pile. Brittle or torn weatherstripping is one of the highest-leverage items to replace each spring before hurricane season — often a 90-minute fix that delivers months of energy savings.

Why This Glossary Matters for Florida Homeowners

Florida door and window terminology mixes federal codes (16 CFR 1201, ADA), state building code (HVHZ, WBDR, TAS standards), manufacturer terminology (PGT, IGU), and field jargon (sash, jamb, mullion). When you’re looking at a contractor quote or an insurance form, the difference between a fair price and an upsell often hides in whether you understand what’s being specified.

Two practical applications:

  1. Reading a quote. A line item that says “TAS 201/202/203 compliant impact-rated SGD with Low-E IGU” is straightforward once you know each term — a sliding glass door tested to HVHZ standards with a heat-reflective insulated glass unit. Without the glossary, that’s intimidating.

  2. Comparing bids. Different contractors describe the same product differently. One might write “impact-rated” while another writes “TAS 203 compliant” — both are accurate but emphasize different aspects. The glossary lets you confirm you’re comparing apples to apples.

If a contractor uses terms not on this list, ask them to define each one in writing. Reputable contractors won’t hesitate.

Frequently Asked Questions

What’s the difference between tempered glass and impact glass?

Tempered glass is heat-treated to break into small pebbles instead of sharp shards — required by federal code in shower doors, exterior doors, and most glass near doorways. Impact glass is laminated (two panes bonded with a polymer interlayer) and tested to survive hurricane debris. Tempered alone is not impact-rated; impact products use laminated glass.

Do I need TAS 201, 202, AND 203 compliance, or just one?

For HVHZ jurisdictions (Miami-Dade, Broward), all three are required for full code compliance — they test different failure modes (impact, static pressure, cyclic loading). A product certified to only one of the three is incomplete for HVHZ.

What does HVHZ stand for and which Florida counties are covered?

HVHZ stands for High-Velocity Hurricane Zone. It covers Miami-Dade and Broward counties only. Every other Florida county is either WBDR or non-WBDR, with progressively less strict requirements moving inland.

Is an FL number the same as Florida Product Approval?

Yes — they’re the same thing. The FL number is the unique identifier assigned to each approved product in the Florida Building Commission’s product approval database. Every code-compliant impact opening in Florida should have one.

Can I use Low-E glass in an impact-rated sliding door?

Yes, and most modern impact sliding doors include Low-E coatings as standard or optional. Low-E and impact-rated are independent product attributes — Low-E refers to the heat-reflective coating; impact-rated refers to the laminated glass + frame testing.

What’s NAP and why does it matter?

NAP stands for Name, Address, Phone — the consistent contact information for a business across every directory and listing. Inconsistent NAP across Yelp, Google Business Profile, BBB, etc. suppresses local search rankings and confuses AI search engines when summarizing local businesses.

When to Call JDM

If you’re navigating a quote, an inspection report, or a Florida Product Approval list and any of these terms still feel unclear, contact JDM Sliding Doors — we’ll walk through your specific quote line by line, no charge. We’ve been installing impact, sliding, pocket, and shower products across Florida for 20+ years and explaining what’s actually being charged for is part of how we earned a 4.9-star rating.

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