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CO & Combustion Safety Testing
This is measurement, not opinion. We test what your appliance actually vents under the conditions your house creates: carbon monoxide in the flue gases, draft measured with the house depressurized the way it really runs — exhaust fans on, doors closed — spillage checked at the draft hood after start-up, and ambient CO in the room. Every reading is written down with the conditions it was taken under, so next year’s numbers mean something against this year’s. Tight houses and powerful range hoods are the usual reason a flue that drafts fine on a mild day backdrafts on a cold one. Where a correction touches gas piping or controls, it is performed or signed off by a licensed professional.
Duration
90–120 min
Warranty
1-year workmanship
Certified
CSIA · Licensed & Insured
Human reply
< 2 min
Prices shown are starting estimates and may change with the condition, access, and scope we find on site. Only a written quote from an on-site visit is a price we commit to.
What is it
What is co & combustion safety testing?
This is measurement, not opinion. We test what your appliance actually vents under the conditions your house creates: carbon monoxide in the flue gases, draft measured with the house depressurized the way it really runs — exhaust fans on, doors closed — spillage checked at the draft hood after start-up, and ambient CO in the room. Every reading is written down with the conditions it was taken under, so next year’s numbers mean something against this year’s. Tight houses and powerful range hoods are the usual reason a flue that drafts fine on a mild day backdrafts on a cold one. Where a correction touches gas piping or controls, it is performed or signed off by a licensed professional.
Every co & combustion safety testing includes:
- Flue-gas CO and draft measured under worst-case depressurization
- Spillage test at start-up and after warm-up
- Ambient CO readings recorded by room
- Written results with the test conditions noted
- Corrections listed where readings fail
Why choose us
Why DFW homeowners pick Chimney Standard for co & combustion safety testing.
We've worked on 0+ DFW homes over 15+ years. Every job — small sweep or full rebuild — runs the same way: certified technicians, written quotes, photo reports, warranty in writing.
15+
Years experience
CSIA
Certified techs
22
Metros covered
CSIA-certified inspectors only
Written quote before any work begins
1-year workmanship warranty
Insurance-grade photo documentation
Who we are
Chimney Standard. 15+ years on DFW chimneys.
Family-owned, CSIA-certified, NFPA 211–compliant. We're the team you call when you want it done right the first time — no rotating subcontractors, no upsell pressure, no surprises. Same techs, same trucks, same standard.
CSIA Certified
Chimney Safety Institute of America
NFPA 211 Compliant
Code-compliant on every job
Owner on every job
Personal accountability, every time
1-year workmanship warranty
In writing, every job
Chimney Standard
DFW Metroplex · CSIA-Certified
NFPA 211
Code compliant
CO & Combustion Safety Testing by location
Dallas, TXPlano, TXFrisco, TXMcKinney, TXFort Worth, TXArlington, TXIrving, TXGarland, TXGrand Prairie, TXMesquite, TXRichardson, TXAllen, TXCarrollton, TXDenton, TXLewisville, TXFlower Mound, TXThe Colony, TXCoppell, TXGrapevine, TXSouthlake, TXColleyville, TXKeller, TXTrophy Club, TXWestlake, TXHighland Park, TXUniversity Park, TXAddison, TXFarmers Branch, TXDuncanville, TXDeSoto, TXCedar Hill, TXLancaster, TXRowlett, TXRockwall, TXWylie, TXSachse, TXMurphy, TXFairview, TXProsper, TXCelina, TXLittle Elm, TXArgyle, TXRoanoke, TXHaslet, TXNorth Richland Hills, TXHurst, TXEuless, TXBedford, TXWatauga, TXBurleson, TXMansfield, TXMidlothian, TXWaxahachie, TXEnnis, TXKaufman, TXTerrell, TXForney, TXHeath, TXFate, TXRhome, TXHouston, TXSugar Land, TXThe Woodlands, TXPearland, TXLeague City, TXConroe, TXMissouri City, TXAtascocita, TXKingwood, TXCypress, TXSpring, TXKaty, TXFriendswood, TXHumble, TXTomball, TXRichmond, TXAustin, TXRound Rock, TXCedar Park, TXGeorgetown, TXLeander, TXSan Marcos, TXPflugerville, TXKyle, TXHutto, TXLakeway, TXBuda, TXManor, TXBastrop, TXBee Cave, TXDripping Springs, TXSan Antonio, TXNew Braunfels, TXSchertz, TXCibolo, TXSeguin, TXConverse, TXBoerne, TXUniversal City, TXLive Oak, TXLeon Valley, TXFair Oaks Ranch, TXHelotes, TXAlamo Heights, TXFloresville, TXBulverde, TXGarden Ridge, TX
FAQ
Common questions about co & combustion safety testing.
What's the difference between Level 1, 2, and 3 chimney inspections?
They're tiers of access, defined in NFPA 211. Level 1 covers readily accessible areas — the routine annual check when nothing has changed. Level 2 adds a camera scan of the flue interior plus attics and crawl spaces, and it's required at property sale, after a fire, or when the appliance or fuel changes. Level 3 involves removing components or finish materials to reach a suspected hidden hazard. Each tier has to be justified by the one below it.
When is a Level 2 inspection actually required?
NFPA 211 names the triggers: sale or transfer of the property, after a chimney fire or operating malfunction, after external events like storms or seismic activity, and whenever you change the fuel type or connect a new appliance. If any of those apply, a Level 1 isn't sufficient — the standard wants the flue interior scanned, not just eyeballed from the top and bottom.
What do I actually get after an inspection?
A written report, standard turnaround 48 hours. It lists every checkpoint with a pass or fail verdict, a photo behind each finding, the relevant code or standard reference, and — when something fails — what correcting it involves. It's a document you can forward to an insurer, a buyer, or another contractor for a competing bid. Nothing we say on-site counts until it's in the report.
How often does a chimney really need sweeping?
The honest answer is: when measurement says so. NFPA 211 requires annual inspection, but sweeping is triggered by creosote depth — 1/8 inch is the threshold. A fireplace burning most nights all season usually hits that in about a year. Occasional weekend fires might take two or three. We measure at each inspection and only recommend a sweep the measurement supports.
My home inspector already looked at the chimney. Isn't that enough?
General home inspectors do visual checks from the ground and the firebox — their own standards of practice put chimney flue interiors outside scope. The failures that cost real money, like gapped flue tiles and hidden cracking, only show on a camera scan. That's why NFPA 211 specifies a Level 2 at property transfer. Plenty of chimneys pass; the point is knowing before you close, not after.
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15+
Years in the field
NFPA 211
Checklist
48h
Written report
< 2hr
Response
Ready when you are
Get it inspected. Get it in writing.
Flat fee confirmed when you book. Same-week scheduling. A pass/fail verdict within 48 hours.
Licensed & Insured Same-Week Scheduling Photo-Documented Findings
Emergency
24/7 Response
Chimney fire, storm hit, active leak, or a flue you're not sure about? We answer 7 AM to midnight and the assessment ends in a written safe-to-use verdict — including a do-not-use notice when the evidence supports one. After-hours dispatch runs subject to crew availability.
Emergency line