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No.467 Changjiangzhong Road, Huangdao District, Qingdao City, China
20th Aug, 2026
Here is the short answer up front: if you supply or install windows in North America, the PDH78 is the classic American double hung window reborn with modern engineering — a 78 mm three-chamber vinyl system with an integrated nailing fin for fast replacement installation, 1.5 mm aluminum reinforcement for wind-load stability, cam-lock security, tilt-turn cleaning, double glazing, and an invisible roll-up insect screen. It is the specification that matches how North American contractors actually install and how homeowners actually live. Keep reading for the full technical breakdown, comparison tables, and maintenance guide — or get the essentials immediately.
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The market numbers explain the demand. The North American double-hung windows market was valued at approximately USD 4.75 billion in 2025 and is projected to reach USD 8.11 billion by 2035 (Double-Hung Windows Market Research, June 2026). The U.S. vinyl window and door market alone stands at roughly USD 7.3 billion (Freedonia), and the residential energy-efficient windows segment is set to climb from USD 12.4 billion in 2025 to USD 13.45 billion in 2026 (Future Market Insights, March 2026).
Two forces drive that growth. First, replacement and renovation: U.S. window-market expansion through 2026–2030 is driven primarily by replacement, renovation, and energy-upgrade demand (HIRI Window Market Watch, June 2026). Second, energy savings that pay for themselves: the U.S. Department of Energy estimates that energy-efficient windows can save each household roughly USD 300–500 per year in energy costs (Research and Markets), while replacing single-glazed or aging double-glazed units with energy-efficient windows can cut annual energy consumption by 20–30% (MarketIntelo, June 2026). On a global scale, the UPVC windows and doors market is projected to grow from USD 30.8 billion in 2025 to USD 32.4 billion in 2026, reaching USD 46.2 billion by 2033 at a 5.2% CAGR (Grand View Research).
That is exactly the market the PDH78 was built for: a North-American-native window format, engineered for the retrofit wave, at a price point distributors and contractors can build programs on.
Parameter | Specification |
System | PDH78 Vinyl Double Hung Window System |
Structure Depth | 78 mm |
Frame Structure | 3 chambers |
Reinforcement | 1.5 mm aluminum liner (full-frame) |
Lock System | Cam lock |
Opening | Double hung vertical slide + tilt-turn function |
Glass Options | Double glazed (insulated glass unit) |
Frame Colors | White / Customized |
Insect Screen | Invisible roll-up screen / Fiberglass screen |
Installation | Integrated nailing fin |
Best For | North American replacement and new residential projects |
The PDH78’s most market-relevant feature is its integrated nailing fin — the installation flange that North American framers and contractors expect on vinyl windows. Because the fin is factory-integrated into the frame, crews nail the window directly to the rough opening, flash and seal it, and move on. No separate fin kits, no field assembly, no guesswork about flashing order. For replacement projects, where dozens of units move through a job in days, that install-speed advantage is real money.
A double hung window spans wide, tall openings and carries two operating sashes plus counterbalance hardware — structural stiffness is not optional. The PDH78 combines three design layers:
78 mm structure depth for a rigid, stable frame envelope.
Three chambers of still air that break the conduction path between interior and exterior while stiffening the profile.
A 1.5 mm aluminum reinforcement liner running through the frame and sashes — the same reinforcement philosophy used in high-wind coastal UPVC systems — giving the PDH78 excellent wind-load resistance and long-term dimensional stability across large sash sizes.
The result: sashes that slide freely today and stay square years from now, with no sag, twist, or racking at the meeting rails.
The PDH78 preserves the format Americans grew up with — two vertically sliding sashes, a top and a bottom, opening flush within the frame plane so nothing protrudes into walkways, patios, or porches. Around corridors and terraces, that space-saving geometry beats any outward-opening window.
On top of the classic slide, the PDH78 adds the tilt-turn function: unlock the cam locks, tilt the lower sash inward at the top, and both faces of the glass are reachable from inside the room for cleaning. And because the sash tilts while remaining latched at the bottom, it becomes a weather-safe ventilation position — fresh air flows in even while it rains, without water running down the wall. For multi-story buildings, it means exterior glass is cleaned safely from indoors, with no ladders and no fall risk.
Each sash closes with cam locks — the standard North American locking hardware — that draw the sash tight against the weather seals when engaged. Simple, robust, and familiar to every installer and homeowner in the region.
The PDH78 ships with double glazing — a sealed insulating glass unit with a gas-filled cavity that cuts winter heat loss and summer solar gain, reduces condensation, and noticeably dampens outside noise. Paired with the DOE-style savings math above, it turns a window replacement into a utility-bill improvement.
Two screen options are available: a standard fiberglass screen for reliable year-round insect protection, and an invisible roll-up insect screen that retracts into the frame when not in use — bug protection without the visual interruption, a feature homeowners increasingly ask for.
White remains the default for North American vinyl, and the PDH78 is available in white or customized colors to match historic districts, HOA requirements, or project-specific palettes.
The PDH78 is manufactured by Qingdao Honor Building Products, a professional group fabricator founded in 2015 and headquartered in Qingdao, Shandong Province, China — one of China’s principal export gateways for building materials.
Honor is a specialist by design: UPVC and aluminum window and door systems, nothing else. The UPVC portfolio spans casement series from 60 mm through 82 mm, sliding systems from 62 mm through 112 mm, and single- and double-hung vinyl windows. The aluminum line covers casement, awning, and sliding windows plus casement, sliding, and folding doors, including thermally broken aluminum systems. One supplier, the entire building envelope.
Trust signals for procurement teams:
Verified supplier status: Alibaba Top Supplier with an Attestation of Conformity — a baseline many North American buyers now check before shortlisting.
Real export track record: products already shipped to Germany, Cyprus, the United States, the Bahamas, Jamaica, Saint Lucia, Chile, Bolivia, and the Philippines, with containerized export packaging designed for long ocean transits.
Customer feedback on the double hung line: a Texas buyer describes the PDH78 as “american hung in cheap price with good quality” — exactly the value equation distributors need for volume programs.
Flexible B2B cooperation: Honor works directly with distributors, retailers, contractors, and property developers on custom orders — project-specific sizes, colors, glazing packages, and hardware specifications included.
Feature | PDH78 (Double Hung) | Single Hung Window | Casement Window |
Operating Sashes | Two (top + bottom) | One (bottom only) | One side-hung sash |
Nailing Fin Installation | Integrated fin — standard North American install | Often available | Varies by system |
Cleaning from Inside | Tilt-turn — both sashes reachable indoors | Lower sash only | Swing-in models only |
Ventilation Control | Top + bottom; rain-safe tilt position | Bottom only | Full opening |
Space Profile | Flush — nothing protrudes outside | Flush | Opens outward/inward |
Wind-Load Stability | Excellent — 78 mm + 3 chambers + 1.5 mm aluminum liner | Good | Good |
Security Hardware | Cam lock | Cam lock or similar | Multi-point locks (typically higher) |
Insect Screen | Standard fiberglass + invisible roll-up option | Screen standard on operating sash | Screen often external |
Classic American Aesthetic | Yes — traditional double hung look | Yes | More modern/European look |
Best For | Residential replacement, traditional-style homes, corridors and patios | Budget residential | Modern architecture, European-style projects |
Aspect | PDH78 Double Hung | Horizontal Sliding Window |
Slide Orientation | Vertical (up/down) | Horizontal (left/right) |
Regional Preference | Standard across North America | Common in apartments, some regions |
Drainage & Rain Performance | Good — sashes shed water vertically | Good |
Cleaning Access | Tilt-turn from inside | Remove sash or clean from outside |
Aesthetic | Classic colonial/traditional | Contemporary minimal |
Best For | Single-family homes, replacement programs | Multi-unit residential, commercial |
Takeaway: for North American residential replacement programs, the double hung format is the native specification — and the PDH78 is that format engineered with the reinforcement, nailing fin, tilt-turn cleaning, and screen options that installers actually use.
Vinyl double hung windows are among the lowest-maintenance fenestration products on the market — no painting, no rot treatment, no coating renewal. A few minutes of routine care keeps the PDH78 sliding, sealing, and saving energy for 25+ years. Here is the schedule:
Wipe frames and sashes with mild soapy water and a soft cloth. Never use solvents, abrasive pads, or acetone — they dull and can permanently damage the vinyl surface.
Clean glass with a pH-neutral or vinegar-based cleaner.
Clear the weep holes at the bottom of the outer frame. A blocked weep hole traps rainwater inside the frame — the single most common cause of internal damage across all window systems.
Lubricate the slide tracks and balance hardware with a dry PTFE or silicone spray — never oil-based lubricants, which attract dust and gum up the slide mechanism.Operate each sash through its full range and tilt-turn/out at least once to keep the tilt mechanism and hinges moving freely.
Clean and lightly lubricate the cam locks; a sticking lock is almost always dirt, not wear.
Inspect weatherstripping and gaskets along the full sash perimeter. Look for flattening, cracks, or sections pulling out of the groove, and replace damaged gaskets promptly — a small gap around one sash silently erodes the energy savings the double glazing was chosen for.
Vacuum or soft-brush the screen mesh and check that the invisible roll-up screen (where fitted) retracts smoothly into its cassette.
Remove the lower sash (and upper, where design permits) and deep-clean the balance tracks and drainage channels.
Check exterior sealant joints between the nailing fin, flashing, and wall; reapply exterior-grade sealant where cracking or gaps appear. Proper flashing-to-fin sealing is what keeps the rough opening dry for decades.
Re-torque visible hardware screws — cam lock strikes and balance shoe anchors work best when everything sits square.
Inspect glazing beads for UV hardening; in high-sun climates, plan bead replacement every 10–12 years.
Sash slides stiffly or drifts → clean the tracks and check the balance shoes; in most cases this is dirt or a slipped balance, not a broken window.
Sash won’t stay up → the balance mechanism needs adjustment or replacement — a standard, low-cost service part on double hung systems.
Sash won’t tilt or won’t latch → check for debris in the tilt mechanism and clean the cam lock strike; if it still won’t latch, verify the sash is seated level in its tracks before suspecting hardware.
Condensation on the frame (not glass) → usually indoor humidity, not a product fault; improve ventilation before suspecting the window.
Q1. What is a nailing fin, and why does it matter for my replacement project?
The nailing fin is the factory-integrated installation flange that frames the window and lets crews nail it directly into the rough opening — the standard installation method for vinyl windows across North America. Because the PDH78’s fin ships integrated, installers save time on every unit and follow a predictable flashing sequence.
Q2. Does the PDH78 really tilt in for cleaning?
Yes. Unlock the cam locks and the lower sash tilts inward at the top, giving full interior access to both faces of the glass. On upper stories, that means cleaning from inside the room — no ladders required.
Q3. How strong is the PDH78 against wind and structural loads?
Very good for its class. The 78 mm profile depth, three-chamber structure, and a 1.5 mm aluminum reinforcement liner running through the frame and sashes give the PDH78 excellent wind-load resistance and long-term stability, even across large sash sizes.
Q4. Can the PDH78 provide ventilation when it rains?
Yes — the tilt position doubles as a rain-safe vent. The sash stays latched at the bottom while tilting open at the top, so air flows in but rain runs off the glass instead of entering the room.
Q5. What colors are available?
White as standard, plus customized colors to match project, historic-district, or HOA requirements.
Q6. What glass does the PDH78 use?
Double glazing — a sealed insulating glass unit with a gas-filled cavity — for reduced heat loss, less condensation, and noticeably better acoustic comfort than single glazing.
Q7. Can I order custom sizes, and do you ship to the United States?
Yes. Qingdao Honor Building Products manufactures the PDH78 to project-specific dimensions and has an active export record to the United States, the Bahamas, and Jamaica, among other markets. Send your opening schedule and quantity for a precise quote with containerized export packaging.
Q8. What is the typical MOQ and lead time?
MOQ terms are flexible for distributors planning program orders. Lead times depend on order size and customization — contact the Honor sales team with your quantity and specification for a precise schedule.
Replacement demand, energy-cost math, and regional preference all point to the same specification: an American-format double hung window that installs fast and performs for decades. The PDH78 delivers it — integrated nailing fin, 78 mm three-chamber frame with 1.5 mm aluminum reinforcement, cam-lock security, tilt-turn cleaning, rain-safe ventilation, double glazing, and fiberglass or invisible roll-up screens — backed by a fabricator with verified supplier status, real export experience to North America, and a full UPVC + aluminum catalog under one roof.
Send us your window schedule or floor plan, and our engineers will calculate thermal performance and provide a free quote within 24 hours. Contact the Qingdao Honor Building Products team today to discuss your project, request technical drawings, or order samples.
No.467 Changjiangzhong Road, Huangdao District, Qingdao City, China
