People searching for Firman generator decibels want to know how loud the thing will be at a campsite, in a driveway during an outage, or next to a job site trailer. Firman answers with a number on nearly every current product page, and unlike many makers it usually says what load the number describes. This page lists every current US Firman generator with a published figure, explains what those figures do and do not cover, and ranks them only against figures stated the same way.
All figures come from Firman's US product pages, read on October 5, 2026. We also opened the English owner's manuals for ten of these models; none of them gives a noise figure. How Firman compares with Honda, WEN, Champion and others is a separate question, covered in our guide to the quietest generators for camping.
Our picks are listed above, with full specifications for each.
Each Firman page has a spec strip, a short list of features, and the noise figure sits in it with a load beside it: "58dB ¼ load" on the W03382, "59 dB at 1/4 load" on the W01785, "67dB at 50% load" on the H03654, "75 dB at 7m and 75% load" on the P03504. Firman writes the load several ways, 1/4, ¼ and 25%, which all mean the same thing. It writes "dB" throughout and never "dBA" on these pages, so we quote dB.
So a Firman figure is a sound pressure level at a stated load, and, on some open frame models, at a stated distance of 7 meters, about 23 feet. A quarter load on a 3,300 watt inverter is about 825 watts: a small fridge, some lights and a fan. Plug in an RV air conditioner and the engine speeds up, and Firman does not say how loud it gets then. Roughly every 10 decibels sounds about twice as loud, so the 24 dB spread across Firman's current figures is very large. Our decibel chart puts these levels beside everyday sounds.
Two things make Firman's numbers harder than they look. First, it mixes loads across its range: most inverters are rated at 1/4 load, but the gasoline open frame line is rated at 75% load, and a few dual fuel and tri fuel models at 50% or 3/4. A 67 at quarter load and a 75 at three-quarter load are not two machines one notch apart; they are two different tests. Second, the description under the spec strip sometimes gives a different number. Our explainer on comparing decibel ratings covers why you can only compare like with like.
When a page gives two numbers
Five current pages disagree with themselves. We show both numbers and do not rank these models. If you are planning around one, assume the higher.
- W03663OF, open frame inverter, 3,650 running watts: the strip says "67dB ¼ load"; the description says it "runs cool at a quiet 64dBs".
- P06701, gasoline open frame, 6,700 running watts: the strip says "81 dB at 7m and 75% load"; the description says it "runs at 72dB".
- T08073, tri fuel open frame, 8,000 running watts: the strip says "74dB 1/2 load"; the description says it "operates at just 72 dB".
- T12071, tri fuel V-Twin, 12,000 running watts: the strip says "78dB at 1/4 load"; the description says "emitting a controlled 83dB".
- T13071, tri fuel V-Twin, 13,500 running watts: the strip says "81dB at 1/4 load"; the description says "Operating at 78 dB".
Most other descriptions either repeat the strip or give the same number with no load, such as the P03613's "3650 watts at just 67dB" beside "67db at 50% load". We treat those as consistent.
Quarter load, distance not stated: quietest first
These are the current models where Firman states 1/4 load (or 25%) and no distance. They can be ranked against each other, but not against the 7 m figures further down.
- 58 dB: the Whisper inverters W03083, W03382, W03383 and W03386 (3,000 to 3,300 running watts), and the dual fuel Whisper Hybrid WH02942, WH03242 and WH03342. The W03385 and the Lowe's exclusive WH03348 list the same figure but were out of stock on Firman's site.
- 59 dB: the small Whisper inverters W01682, W01781, W01782, W01783 and W01785, 1,600 to 1,700 running watts.
- 64 dB: the W02081, 2,000 running watts, and the tri fuel WT03571.
- 67 dB: the 120/240V Whisper inverters W05583, W06383, WT06073 and WT06375; the dual fuel open frame H03655; the gasoline open frame P03628 and P03630; and the tri fuel open frame T04472. The P03632, T04073 and WH03562OF list the same and were out of stock.
- 74 dB: the dual fuel H08052 and tri fuel T07573 and T08072, 7,500 to 8,000 running watts on gasoline.
- 76 dB: the tri fuel T09275 and T09371, 9,200 to 9,300 running watts.
Quarter load at 7 m
- 67 dB: the P03631, a 120/240V gasoline open frame model. Its strip says "67dB at 7m and 25% load". It is the only current Firman with both a light load and a distance stated.
Half load, distance not stated
- 67 dB: the dual fuel H03654 ("67dB at 50% load"), the propane-only L03391 ("67 dB 1/2 load") and the gasoline P03613 ("67db at 50% load"), all with 208cc engines and 3,300 to 3,650 running watts.
Three-quarter load at 7 m: quietest first
This is the Performance series, Firman's gasoline open frame line. Each strip says "at 7m and 75% load".
- 74 dB: P01204, 1,200 running watts.
- 75 dB: P03502, P03503, P03504 and P03634, 3,550 to 3,650 running watts.
- 81 dB: P05702, P06702, P06705, P06707 and P09305, 5,700 to 9,300 running watts.
- 82 dB: P08008 and P08013, 8,000 running watts.
Three-quarter load, distance not stated
- 74 dB: T11671, tri fuel, 9,300 running watts.
- 76 dB: T06373 and T08273, tri fuel, 6,300 and 6,600 running watts.
- 80 dB: T09376, tri fuel, 9,300 running watts.
- 81 dB: P12002, gasoline, 12,000 running watts ("81dB @ 3/4 load").
The T11671 and T09376 list the same 459cc engine and the same 11,600/9,300 watt output, yet their pages give 74dB and 80dB at 3/4 load. We list both as published, but a 6 dB gap between near-identical machines is a reminder that small differences between Firman figures may not mean much.
We found no noise figure on the pages for the H05751, a 5,700 watt dual fuel open frame model, or the W01687, a 1,600 watt inverter whose page showed no price. The W05381 page lists "64 dB 25% load" in its strip and "67 dB at 25% load" in its description, but says "This item is only available to ship to Canada", so we leave it out. Firman also keeps a discontinued collection of 57 older models; we have not covered those. The Zero E units are battery power stations and are not covered here.
What changes the noise between Firman models
- The series. Firman sorts its range into Whisper, Hybrid and Performance. Its buying guide says "The Whisper Series provides a clean, quieter and efficient power source for any circumstance." Every current figure from 58 to 64 dB at 1/4 load belongs to a Whisper or Whisper Hybrid inverter.
- Enclosed or open frame. Firman's open frame models with a 208cc engine, such as the H03655, P03628 and P03630, list 67 dB at 1/4 load. The enclosed Whisper models with a 193cc engine list 58 on the same basis. That is 9 dB, close to twice as loud.
- Engine size. Bigger engines mostly carry higher figures: 67 dB at 1/4 load for the 322cc inverters, and 74 to 76 for the 439cc and 459cc open frame models. The small end breaks the pattern: the 80cc inverters list 59, one more than the 171cc and 193cc models at 58, and the 80cc W02081 and 145cc WT03571 list 64.
- Load. The P03631 and P03634 share a 208cc engine and 3,650 running watts. Firman lists 67 dB at 7 m and 25% load for one and 75 dB at 7 m and 75% load for the other. They are different models, but the 8 dB gap is a fair picture of what a heavier load adds.
Firman's quiet features, in its words
Firman credits the muffler. The W01785 page says "The Whisper Series muffler keeps noise levels as low as 59 dB at ¼ load, meeting National Park sound standards", and the W03383 page says the Whisper Series muffler "ensures a quiet operation compared to standard generators". The federal park rule is 60 decibels at 50 feet; Firman does not say at what distance its figures were taken, so we cannot check that claim.
It also credits Eco Mode. The W03083 strip says "Eco mode varies in engine speed depending on load of maximum fuel efficiency", and the W03382 page says "The integrated Eco Mode automatically adjusts engine speed to reduce fuel consumption and extend runtime". The WT03571 manual goes further. It describes an "economy mode control switch, which automatically adjusts the engine speed based on the electrical load to achieve an optimal balance among fuel consumption, noise level and output performance", a Super ECO Mode that "effectively reduces the overall noise and fuel consumption of the unit", and a Turbo Mode in which "The engine runs at a constant high speed". Firman publishes no figure for any of these modes, so the WT03571's 64 dB at 1/4 load does not say which mode it was taken in.
Safety comes before noise
Most current Firman models carry CO Alert. The W01785 page says it "automatically shuts the generator down if harmful carbon monoxide levels are detected." Treat it as a backstop, not a reason to bring the generator closer. Never run a generator in a garage, a shed or near an open window to cut the noise. For backup at home, our guide to quiet generators for home backup covers placement and 240V models from other makers, and our guide to the quietest inverter generators under $1,000 sets the W01785 beside rivals at similar prices.
How we chose
We read Firman's all generators collection, set aside the models in its discontinued and refurbished collections, and opened the product page of every remaining generator. Picks reflect Firman's figures, the conditions it states, output, weight, features and the price on Firman's site, read on October 5, 2026. Where a page shows a sale price, the catalog entry says so.
We did not measure any of these generators. Every figure on this page is Firman's own, quoted from its US product pages as read on October 5, 2026, with the load and distance Firman gives and a note wherever it gives none.
