Is the Fibre-Metal 4178DGN by Honeywell the right replacement window for a Fibre-Metal crown owner who wants a tinted visor?

Short answer: If you already own a Fibre-Metal crown protector and want a dark-green tinted propionate window instead of clear, the 4178DGN is the correct swap-in — it ships as the lens only and is pre-formed to seat in the Fibre-Metal 4-series system, so it is not a standalone shield and brings no headgear. Buy it to replace a scratched window or to add glare reduction; if you need clear optics buy the 4178CL instead, and if you don't already run a Fibre-Metal crown start from a complete unit in our face shields collection and read how to choose a face shield first.

Fibre-Metal 4178DGN by Honeywell Face Shield Window Review (2026)

The 4178DGN is a replacement window, not a complete face shield — it is the curved propionate lens by itself, injection-molded and pre-formed at the factory to the exact curve of Fibre-Metal crown protectors for a tight seal against dust and debris. That makes this a compatibility decision, not a wearability one: the window seats into a Fibre-Metal 4-series crown such as the F300 headgear or hangs off a Fibre-Metal mount system, and it does the job a face shield is meant to do — act as secondary face protection worn over primary safety glasses or goggles per OSHA 29 CFR 1910.133, never as a standalone substitute for eyewear. The DGN suffix denotes a dark-green tint that cuts glare and brightness for general grinding, bright outdoor, and nuisance-light tasks; it is a tint, not an IR shade number, so if your hazard is radiant heat from welding or torch work you want a shade-rated window like the 4178IRUV3 or Honeywell 4178IRUV5 instead. Compatibility here is system-specific: a Fibre-Metal window is pre-formed to Fibre-Metal crowns, so it will not seat correctly on a Jackson Safety or MSA V-Gard headgear, and our safety glasses vs face shields guide explains why the shield layers on top rather than replacing eyewear.

Editorial verdict — 4.0/5
For an existing Fibre-Metal crown owner who wants a tinted window, the 4178DGN is a cheap, correct, drop-in consumable that restores protection and adds glare control — just confirm you want a green tint and not clear optics or a rated IR shade before you buy.VIEW ON WC SAFETY →CHECK PRICE ON AMAZON →

As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are accurate as of the date shown and are subject to change. Full affiliate disclosure.

Who it is for

• Existing Fibre-Metal crown owners replacing a scratched or hazed window who want to add a glare-reducing tint, paired with the F300 headgear
• Grinders and outdoor metal workers who want brightness and glare knocked down but do not need a rated IR welding shade — see best face shields
• Maintenance and fabrication shops standardized on Fibre-Metal who keep spare windows on hand as consumables
• Buyers who want OEM Fibre-Metal fit and seal rather than a generic aftermarket window for their face shield
• Crews comparing tint options against the clear 4178CL and IR-rated 4178IRUV3 before committing

What the Fibre-Metal 4178DGN does well

Exact-curve OEM fit

The window is injection-molded and pre-formed at the factory to the precise curve of Fibre-Metal crown protectors, so it snaps into the F300 headgear and other 4-series crowns with a tight seal against dust and debris rather than the gaps you get from a forced-fit generic window.

Propionate durability

Like its clear sibling the 4178CL, the DGN is propionate — a window material with good chemical and surface-crazing resistance that holds up better than bare acetate in a working shop, which is why Fibre-Metal standardizes on it across the line.

Built-in glare control

The dark-green tint cuts brightness and glare for grinding and bright outdoor work, so you get tint without buying a separate shield or clipping on a sun visor like the Paulson A-S4-B2; see best face shields for where tint helps.

Low-cost consumable

Because it is the lens only, the 4178DGN restores a scuffed rig at a fraction of the cost of a full assembly, the same replacement-window logic behind parts like the ERB 15151 and Honeywell 11390064.

Correct secondary-protection role

As a face shield window it covers brow-to-chin over your primary eyewear per OSHA 1910.133, exactly the layered approach explained in safety glasses vs face shields and ANSI Z87.1 explained.

Where the Fibre-Metal 4178DGN falls short

No headgear in the box

This is a bare window with no crown or suspension, so first-time buyers who don't already own a Fibre-Metal crown can't use it — they should start from a complete unit like the F5500 hard-hat shield or browse the face shields collection.

Locked to the Fibre-Metal system

The pre-formed curve that makes it fit Fibre-Metal crowns is exactly why it won't seat on a Jackson Safety 29104 or MSA V-Gard frame — cross-brand swaps don't work, so confirm your crown is Fibre-Metal.

Tint is not a welding shade

The green tint reduces glare but carries no rated IR/UV shade number, so it is the wrong window for radiant heat — torch and arc work need a shade-rated lens like the 4178IRUV3 covered in best face shields for welding, grinding and cutting.

Propionate impact ceiling

Propionate clears ANSI Z87.1 for general use but is more impact-limited than polycarbonate, so heavy chipping and grinding may favor a polycarbonate window such as the 3M WP96C.

Fibre-Metal 4178DGN vs the competition

Compare prices on Amazon →Fibre-Metal 4178DGN on AmazonFibre-Metal 4178CL

When to step up from the Fibre-Metal 4178DGN

If a green tint isn't what you actually need, step sideways within the same Fibre-Metal 4178 family rather than across brands: the clear 4178CL (also sold as the Honeywell 4178CL) is the right window for indoor and detail work, while the 4178IRUV3 and Honeywell 4178IRUV5 add rated IR/UV shade for torch and cutting work. If you've outgrown the crown itself, step up to a complete Fibre-Metal rig — the F5500 hard-hat faceshield or the F5400 speedy-loop mount for frequent on/off — or compare full units in best face shields.

Category context

The 4178DGN is a single-purpose consumable in a three-part catalog: complete shields, replacement windows, and headgear/accessories. It is the replacement window — the bare tinted propionate lens — so the buying decision is about compatibility with your existing Fibre-Metal crown, not comfort or coverage. Treat it as the wear part you keep in stock, swap it on the schedule below, and confirm your hazard matches a green tint before ordering. For the wider impact-versus-splash-versus-radiant-heat picture, read how to choose a face shield.

Total cost of ownership

Replacement windows are a running cost, and that is the point of buying one. A propionate window like the 4178DGN should be swapped the moment it hazes, deep-scratches, or develops crazing that distorts vision — in a busy grinding or fabrication shop that can be every few weeks, in lighter duty every few months. Keeping spares on hand means the Fibre-Metal crown (the expensive, durable part) stays in service for years across many window changes, the same economics that drive stocking parts like the ERB 15151 or the clear 4178CL. Because the DGN is tinted, also retire it if the tint no longer matches the task — switching to clear or IR is a window swap, not a new rig. If your crown suspension itself is worn rather than the window, that's a headgear replacement; price a fresh F300 or a complete unit from the face shields collection against re-windowing the old one.

Final verdict

Buy the Fibre-Metal 4178DGN if — and only if — you already run a Fibre-Metal crown and specifically want a dark-green tinted propionate window for glare reduction on grinding or bright-light work; it's a correct, low-cost OEM swap-in. If you want clear optics, get the 4178CL; if you face welding or torch radiant heat, get a shade-rated window like the 4178IRUV3 or Honeywell 4178IRUV5 and read best face shields for welding, grinding and cutting. If you don't own a Fibre-Metal crown at all, skip the bare window and start from a complete shield in our face shields collection after reading how to choose a face shield and safety glasses vs face shields.

VIEW ON WC SAFETY →CHECK PRICE ON AMAZON →

Fibre-Metal 4178DGN FAQ

Does the Fibre-Metal 4178DGN come with headgear?

No. The 4178DGN is the replacement window only — there is no crown, suspension, or headgear in the box. You need an existing Fibre-Metal crown protector to use it; if you don't have one, start from a complete unit like the F300 headgear or browse the face shields collection.

What headgear does the 4178DGN fit?

It is pre-formed to the curve of Fibre-Metal crown protectors in the 4-series system, so it seats on Fibre-Metal crowns such as the F300. Fit is system-specific, so confirm your crown is a Fibre-Metal unit before ordering — see how to choose a face shield.

Will the 4178DGN fit a Jackson, MSA, or 3M headgear?

No. The window is pre-formed to the Fibre-Metal crown curve and will not seat correctly on other systems. For those brands use their own windows, such as the Jackson Safety 29104, MSA V-Gard, or 3M 82600.

What does the DGN suffix mean?

DGN denotes a dark-green tint on the window, used to reduce glare and brightness for grinding and bright-light tasks. It is a tint for visual comfort, not a rated IR/UV welding shade — for radiant heat you need a shade-numbered window like the 4178IRUV3.

Is the 4178DGN safe for welding or torch cutting?

It is not the right choice for welding radiant heat. The green tint reduces glare but carries no rated IR/UV shade number, so torch, arc, and cutting work need a shade-rated window such as the 4178IRUV3 or Honeywell 4178IRUV5; see best face shields for welding, grinding and cutting.

What's the difference between the 4178DGN and the 4178CL?

Both are propionate windows pre-formed to the same Fibre-Metal crowns; the difference is tint. The 4178CL is clear for indoor and detail work, while the DGN is dark-green for glare reduction in bright or grinding conditions. Choose by task.

What material is the 4178DGN window?

It is injection-molded propionate, the material Fibre-Metal standardizes on across its windows for chemical and surface-crazing resistance. Propionate clears ANSI Z87.1 for general use but is more impact-limited than polycarbonate, so heavy-impact work may favor a polycarbonate window like the 3M WP96C.

Can I wear the 4178DGN instead of safety glasses?

No. A face shield is secondary protection worn over primary eyewear, never a substitute, per OSHA 29 CFR 1910.133. Wear safety glasses or goggles underneath, as explained in safety glasses vs face shields.

Is the 4178DGN ANSI Z87.1 compliant?

The window is built to meet ANSI Z87.1 basic-impact requirements for general industrial use, the standard that governs occupational eye and face protection. For what the markings mean, see ANSI Z87.1 explained and what does Z87+ mean.

How often should I replace the window?

Swap it as soon as it hazes, deep-scratches, or develops crazing that distorts vision — weeks in heavy grinding shops, months in lighter duty. Keeping spares lets the durable Fibre-Metal crown stay in service across many window changes; the same logic applies to parts like the 4178CL.

Why buy a replacement window instead of a whole new shield?

The crown and suspension are the durable, costly parts; the window is the consumable that wears out. Re-windowing keeps your existing Fibre-Metal rig running cheaply, the same approach behind replacement parts like the ERB 15151. If the crown itself is worn, then replace the headgear instead.

Does the 4178DGN have an anti-fog or hard coating?

The listing describes a hard-coated optical-grade propionate window for surface durability; it does not claim an anti-fog coating. If fogging is your issue, look at shields that specifically list anti-fog, such as the Jackson Safety Quad500.

Will the green tint be too dark for indoor work?

Likely yes — the tint reduces light transmission, so it's better suited to bright outdoor or grinding tasks than dim indoor inspection or fine detail. For low-light work choose the clear 4178CL instead.

How does the 4178DGN compare to a polycarbonate window?

Propionate offers strong chemical and crazing resistance, while polycarbonate offers higher impact resistance. For heavy chipping and impact you may prefer a polycarbonate window like the 3M 82600; for splash and general use propionate is fine. Match the window to your dominant hazard per how to choose a face shield.

Is the 4178DGN a genuine Honeywell part?

Yes — it is a Fibre-Metal by Honeywell window (Honeywell owns the Fibre-Metal brand), so it matches the OEM crown fit and seal rather than approximating it like a generic aftermarket window. The same window is cataloged under both the Fibre-Metal and Honeywell labels, as with the Honeywell 4178CL.

What if I need a tinted complete shield, not just a window?

Then a bare window isn't enough — buy a complete tinted or rated unit. Compare full shields in best face shields, or step up to a Fibre-Metal rig like the F5500 hard-hat faceshield and add the matching window.

Can I mount the 4178DGN on a hard hat?

Only through a Fibre-Metal crown that supports hard-hat mounting — the window itself just supplies the lens. If you want a purpose-built hard-hat shield, look at the Fibre-Metal F5500 or pair the window with a slot-adapter crown; see the hard hats collection for compatible caps.