Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
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AfterDuraFlex Fireplace Services in Allentown: What to Know First
We provide independent DuraFlex fireplace services across Allentown, from gas fireplace tune-ups to firebox repairs and insert conversions. Most DuraFlex jobs we book are completed in a single visit, and you’ll know the full price before we start. We’re not the cheapest outfit in the Lehigh Valley, and we don’t try to be - we charge enough to do the job with the right parts and stand behind it. This page is for homeowners in Allentown who already have a DuraFlex product installed and need service, repair, or an honest assessment of whether it’s worth fixing. Call (610) 632-1394 and a live person will pick up, any hour of the day.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
How DuraFlex Products Fail - and How We Fix Them
- DuraFlex DVC venting systems develop condensation corrosion at the lower elbow. In Allentown’s freeze-thaw climate, the DVC’s inner wall can weep acidic moisture where the vent turns horizontal through a basement rim joist. We’ve replaced dozens of these lower assemblies in homes near Jordan Creek. Our fix: pull the damaged section, inspect the surrounding framing for rot, and reinstall with a properly sloped drain tee - not just a straight coupling that traps water.
- DuraFlex SL stainless liners pull away from the top plate in masonry chimneys. The SL series uses a compression-fit top plate that loosens as the chimney heats and cools through Allentown winters. You might notice drafting problems or a faint smoke smell on startup. We reseat the plate with proper expansion hardware and a stainless storm collar - never silicone alone, which cracks in January.
- DuraFlex AL aluminum venting on gas inserts fatigues at termination caps. The AL series is lighter and costs less, but the thin aluminum threads at the cap connection work-harden over five to ten years of thermal cycling. We see this often in Allentown ranch homes from the 1970s. We replace with a stainless termination where code allows, or transition to a reinforced OEM cap that won’t crack at the flange.
- DuraFlex Pro series flex pipe kinks during insert retrofits. The Pro’s tighter bend radius is a selling point for installers, but we’ve found it can ovalize when pulled through offset clay flues common in West End Allentown homes. An ovalized flex liner restricts draft and collects creosote. We camera-inspect the full run, identify the pinch point, and either reroute or upsize the flex - we don’t leave a compromised airway.
- DuraFlex pellet venting (DuraVent’s pellet line, often confused with DuraFlex) accumulates fly ash at horizontal seams. Homeowners who burn lower-grade pellets from regional suppliers get more clinker buildup at the silicone-sealed joints. The seam gaps, draft drops, and the stove back-puffs on startup. We break down the affected section, clean with a rotary whip, and reseal with high-temp RTV rated for pellet exhaust - not generic caulk from the hardware store.
Our DuraFlex Fireplace Services Process
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You call, a live person answers. We ask what you’re seeing, what you’re burning, and when the unit was last serviced. We schedule a window that works for you - no four-hour “sometime between noon and dark” nonsense.
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Level-2 camera inspection on arrival. Our tech runs a camera through the full DuraFlex vent or liner run. You watch the screen with us. We photograph every defect and explain what we’re seeing in plain English - no jargon, no scare tactics.
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Parts decision: OEM DuraFlex or verified aftermarket. If your DuraFlex component is under warranty, we source OEM to protect coverage. If warranty has lapsed, we may recommend a compatible HeatShield or Gelco equivalent that meets the same UL 1777 standard - we’ll tell you exactly why and what the price difference is.
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The repair, done right, in one visit when possible. Our trucks carry common DuraFlex fittings, termination caps, and liner sections. Most jobs finish the same day. If we need to order a specialty part, we tell you when it’ll arrive and schedule the return before we leave.
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Combustion test and draft verification. For gas units, we check manifold pressure and CO levels at the termination. For wood or pellet, we verify draft with a digital manometer. The numbers go on your invoice.
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Cleanup, documentation, and the 90-Day Done Right Promise in writing. We leave the hearth cleaner than we found it. You get photos, the verdict, and our guarantee: if it’s not right, we make it right - no paperwork, no arguing.
What DuraFlex Fireplace Services Costs in Allentown
These are real ranges for DuraFlex work we’ve done in Allentown homes over the past two years. Your exact price depends on access, parts needed, and whether we find secondary damage once we’re inside.
- Gas fireplace service and DuraFlex vent inspection: $189-$275
- DuraFlex SL liner top plate reseat and seal: $340-$495
- DuraFlex DVC lower elbow replacement with drain tee: $425-$650
- DuraFlex AL termination cap upgrade to stainless: $280-$420
- Firebox refractory panel replacement (DuraFlex insert): $560-$895
- Full DuraFlex liner replacement, gas insert: $1,850-$2,900
What moves the price: height of chimney (two-story Allentown twins cost more than ranches), accessibility of the vent run, and whether we need to remove an existing insert to reach the liner. We give you the full number upfront, before any work starts. Estimates are free - call (610) 632-1394.
Why Allentown Homeowners Call Hearthstone Chimney Co. for DuraFlex Work
We’ve been working chimneys in Allentown for over 42 years. Russell Haines and our crew know the regional brick, the clay flues, and how DuraFlex products behave in Pennsylvania winters. The chimney doesn’t care what it looks like from the street. We check what’s inside.
Our Level-2 camera inspections end with photos you can see and a plain-English verdict - documented like an engineer, explained like a craftsman. We back every job with the 90-Day Done Right Promise in writing. If we install a DuraFlex part and something’s not right, we come back. No arguing, no forms to mail in.
When DuraFlex OEM isn’t the right call, we also work with HeatShield and Gelco - professional-grade brands we trust, never builder-grade substitutes. A square deal, no surprises on the bill. That’s why homeowners in West Park, the West End, and across the Lehigh Valley keep our number.
FAQs
No, proper service by a qualified technician does not void your DuraFlex warranty. As an independent DuraFlex service provider, we follow manufacturer installation and repair standards and document our work. If your unit is still under warranty, we use OEM parts to maintain coverage and note the service record. Call (610) 632-1394 if you need help determining your warranty status.
Most common DuraFlex fittings, caps, and liner sections arrive within two to three business days from regional distributors in eastern Pennsylvania. Specialty or discontinued items may take five to seven days. We check availability when we diagnose the job and schedule the return visit before we leave your home - no callbacks, no wondering when we’ll show up.
Replace when the firebox is cracked through, the venting is corroded in multiple locations, or repair costs exceed 60% of a new insert installed. Repair when the issue is isolated - a failed termination cap, a loose top plate, a worn gas valve. We’ll show you the camera footage and give you both numbers, repair and replace, so you can decide. No pressure either way.
Once annually, before the first fire of the season. Allentown’s hard water and temperature swings stress gas valves and vent seals more than milder climates. An $89 seasonal tune-up catches worn gaskets and burner deposits before they become $400 problems. Skip two years and you’re gambling with carbon monoxide risk - not worth it.
Yes, we do DuraFlex gas conversions regularly in Allentown’s older homes, especially in neighborhoods like West Park where masonry fireplaces were built without liners. We install a DuraFlex AL or SL liner sized to the new gas insert, run the vent to code-clear termination, and pressure-test the system. Most conversions finish in one day. Call (610) 632-1394 for a free estimate - we’ll measure your firebox and give you options.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Allentown and nearby areas.