Use the Available Height
Longer cartridges provide more area per cartridge. Match the housing height to the selected length and retain the lower inlet and settling space.
Modular Vertical Cartridge Dust Collectors
Modular vertical cartridge dust collectors with front-access, drawer-like cartridge replacement, eccentric cam clamping and automatic pulse-jet cleaning.
- Vertical cartridge arrangement
- Automatic pulse-jet cleaning
- Front-access, drawer-like cartridge replacement
- Single or multi-module configurations
Vertical Cartridge ArrangementCartridges installed vertically inside the filter chamber
Front-Access ReplacementDrawer-like slide-out cartridge maintenance
Eccentric Cam ClampingSecure mechanical cartridge compression
Modular ConstructionFlexible capacity expansion
01Cartridge Installation
Front-Access Slide-In Cartridge System
The cartridges are installed vertically below the tube sheet, but routine replacement is performed entirely from the front of the collector. A guided hanging structure, standardized cartridge top plate and eccentric cam clamping mechanism allow each cartridge to be pushed into position in a drawer-like motion without dismantling the clean-air chamber above.
DESIGNED AROUND ROUTINE MAINTENANCE
No Clean-Air Chamber Disassembly
Cartridge replacement does not require removal of the venturis or pulse pipes above the tube sheet. The operator works from the front service opening, releases the eccentric cam clamping mechanism, slides the cartridge along the guide structure, and locks it back into its designed position after replacement.
Front access: no overhead cartridge lifting space is required for routine replacement.
Clean-air side remains untouched: venturis and pulse-cleaning pipes stay in place.
Guided positioning: the cartridge top plate follows the fixed guide structure into its designed location.
Eccentric cam clamping: once the lever is raised into the clamped position, the eccentric geometry applies secure cartridge compression and remains mechanically stable without continuous external force.
STEP 01Open the Front DoorAccess the cartridge chamber directly from the service side of the collector.
STEP 02Release the Cam ClampLower the eccentric cam clamping mechanism to remove the cartridge compression force.
STEP 03Slide the CartridgeHang the steel top plate on the guide structure and push or pull the cartridge in a drawer-like motion.
STEP 04Clamp & AlignRaise the cam lever to lock the cartridges at the designed tube-sheet and pulse-cleaning centerlines.
Structure You Can See
These production photographs show the clamping detail, the untouched clean-air-side components above the tube sheet, and the fixed geometry that keeps each cartridge centered below its corresponding opening.
Open the door. Release the cam. Slide the cartridge out.
The maintenance advantage comes from the installation architecture itself. The cartridges remain vertical in operation, while the front-access slide-in structure avoids the overhead clearance and clean-air-chamber disassembly associated with top-loading replacement methods.
02Airflow & Pre-Separation
Lower-Inlet Airflow & Pre-Separation
The vertical cartridge layout is designed so dust-laden air can enter below the cartridge section, where the larger internal cross-section reduces velocity before the finer dust reaches the filter media. This creates a useful settling and airflow-conditioning zone ahead of filtration.
AIRFLOW DESIGNED AROUND THE FILTER CARTRIDGES
Slow the Dust Before It Reaches the Filter Media
High-velocity dust-laden air is introduced below the cartridges. Once it enters the larger collector body, the available flow area increases and air velocity drops, reducing direct impact on the filter media and giving heavier particles an opportunity to fall toward the hopper before the finer fraction moves upward to the cartridges.
01 · LOWER INLETVelocity ReductionDust-laden air enters beneath the cartridge zone. The sudden increase in cross-sectional area lowers the local air velocity.
02 · PRE-SEPARATIONHeavier Particles Settle FirstCoarser particles lose momentum and tend to fall into the hopper, while lighter fine dust remains suspended and travels upward.
03 · FILTRATION & CLEANINGFine Dust Reaches the CartridgesFine dust is captured on the outer cartridge surface. Differential-pressure or timed control then triggers pulse-jet cleaning so released dust falls into the hopper.
Core design principle: the preferred airflow path is lower inlet → conditioning / settling zone → vertical cartridge filtration → upper clean-air chamber. Depending on the dust concentration and particle characteristics, additional pre-separation equipment may still be required.
Flexible Inlet & Outlet Arrangement
The airflow principle remains the same, while inlet and clean-air outlet positions can be adapted to site space, duct routing and system layout. Large modular systems normally benefit from a dedicated lower inlet / air-distribution section; height-limited layouts may use side-entry arrangements with internal baffles where required.
Keep the airflow principle. Adapt the duct connections to the site.
Inlet and outlet positions are project-configurable. Lower-side, side-entry and other connection arrangements can be designed around available space and duct routing. The important part is maintaining controlled airflow distribution and avoiding direct high-velocity dust impact on the filter media.
03Cartridge Orientation
Why Cartridge Orientation Matters
Inclined cartridges are a proven industrial arrangement, but their upper-facing surface can still provide an area where released dust may settle again after pulse cleaning. A fully vertical cartridge removes this upward-facing dust-resting surface.
REAL OPERATING CONDITION — INCLINED CARTRIDGES
Released Dust Can Settle Again on Upward-Facing Surfaces
The photograph shows an actual inclined-cartridge collector after service. Dust behavior varies with particle characteristics, loading and pulse-cleaning conditions, but the inclined geometry still leaves an upper-facing cartridge surface where part of the released dust can remain or re-settle.
Upward-facing cartridge surface
An inclined cartridge still presents a surface on which released dust can rest after cleaning.
Re-settling depends on the dust
The extent varies with particle size, cohesiveness, dust loading and pulse-cleaning conditions.
Accumulation can increase cleaning demand
Persistent deposits can reduce effective use of part of the media surface and may require more frequent cleaning or maintenance.
Vertical orientation removes the upward-facing dust-resting surface. Released dust can move downward more directly under gravity, complementing the lower-inlet and pre-separation airflow principle described above.
04DHC Model Selection
How to Select a DHC Vertical Collector
Define the duty. Calculate the filter area. Then fit it to the site. Select suitable media and design filtration velocity for the dust and operating conditions. Use the required airflow to calculate area, then choose cartridge length and module arrangement to suit the available space.
- 01Assess the DutyDust properties, inlet concentration and operating conditions.
- 02Select Media & VelocityChoose suitable filter media and a design filtration velocity.
- 03Calculate Filter AreaUse the required airflow and selected velocity.
- 04Check Site SpaceHeight, depth, width and front maintenance access.
- 05Configure the CollectorSelect cartridge length, base module and module quantity.
04.1
Start with the Required Filter Area
A model number is not a fixed airflow rating. The design filtration velocity must be selected for the duty before the required filter area is calculated.
Confirm the Dust & Operating Conditions
Review the dust type and inlet concentration, temperature, moisture and any corrosive or combustible characteristics. Confirm the filtration duty and required airflow before choosing the media and design filtration velocity.
Required effective filter area
A =
Filter area = airflow ÷ (60 × design filtration velocity)
A · area, m²Q · airflow, m³/hv · velocity, m/min
Reference basis: 7US polyester cartridges at 1.0 m/min. This is a preliminary calculation basis for normal dust concentrations, not a universal value. The design velocity must be confirmed for the actual duty.
04.2
Configure Height, Depth & Width
Once the area requirement is known, choose how to accommodate it. Cartridge length, cartridges per module and the number of side-by-side modules provide three different layout choices.
Choose the Base Module
Each module has two front-to-back cartridge rows. More cartridges in each row require a deeper module.
Combine Modules Side by Side
Use more modules to provide additional area, or combine shallower modules where site depth is restricted but width is available.
Standard module
DHC4
4 cartridges / module
2 rows × 22 cartridges front to back in each row
Standard module
DHC6
6 cartridges / module
2 rows × 33 cartridges front to back in each row
Standard module
DHC8
8 cartridges / module
2 rows × 44 cartridges front to back in each row
Standard module
DHC10
10 cartridges / module
2 rows × 55 cartridges front to back in each row
Project-specific
DHC12
12 cartridges / module
2 rows × 66 cartridges front to back in each row
Gold edge = front maintenance side. Top-view cartridge-position schematics only; not dimensional or fabrication drawings. DHC12 is a project-specific option subject to layout and shipping review.
04.3
Same Filter Area. Different Layouts.
With the same cartridge length, media and effective area per cartridge, different module combinations can provide the same total filter area. Select the layout that fits the site.
Same 1000 mm cartridges
112 m²in either layout1 × DHC8 or 2 × DHC4
8 cartridges × 14 m² = 112 m²
Use one DHC8 where depth is available. Where depth is restricted but width is available, place two DHC4 modules side by side.
Same 1000 mm cartridges
168 m²in either layout1 × DHC12 or 2 × DHC6
12 cartridges × 14 m² = 168 m²
Use one DHC12 where depth and transport permit. Two DHC6 modules provide an alternative when a shallower layout or different shipping arrangement is needed.
Front access at the bottom of each plan. Layouts are schematic, not to scale. Equal filter area does not imply identical overall dimensions, pressure loss, cost or transport requirements.
04.4
More Area Without More Cartridges
The same DHC8 module concept can use eight Ø324 mm cartridges of different lengths. At the confirmed media specification, longer cartridges increase area without adding cartridges.
Most common
1000 mm
14 m² / cartridge
112 m² total / DHC8Baseline areaCommon
1200 mm
16.8 m² / cartridge
134.4 m² total / DHC820% more areaProject-specific
1500 mm
21 m² / cartridge
168 m² total / DHC850% more areaLength is a design choice, not a drop-in upgrade. A longer cartridge requires a compatible housing and adequate inlet-conditioning, settling and maintenance space. 1000 and 1200 mm are the most commonly selected lengths. 660 mm, 1500 mm and custom lengths are available for project-specific requirements; 7US manufactures the cartridges in-house.
04.5
From Airflow to a Practical Layout
This example demonstrates the selection method. It assumes that the process has already been assessed and a design filtration velocity of 1.0 m/min has been selected.
Worked example · preliminary area check
One Airflow Requirement. Three Possible Layouts.
Required airflow: 6,000 m³/h
Selected design filtration velocity: 1.0 m/min
6,000 ÷ (60 × 1.0) = 100 m²Required filter area for this illustrative calculation
All three meet the calculated area requirement. Choose the layout that suits the site, then complete the final engineering checks.
Scaling up · the same selection method
50,000 m³/h: Two Modular Options
Assuming a confirmed design velocity of 1.0 m/min:50,000 ÷ (60 × 1.0) ≈ 833.3 m²
Equal filter area, different height and width requirements. These are preliminary area-based options, not fixed airflow ratings or final selections.
Before final selection: confirm overall dimensions, front service clearance, inlet and hopper arrangement, pulse cleaning, fan/system pressure and shipping. Recalculate the required area if the design filtration velocity changes.
Standard Module Reference Data
7US polyester-based Ø324 mm cartridges. Reference airflow = total filter area × 1.0 m/min × 60. Values below are for one base module, not a fixed rating for every duty.
| Base module | Cartridges per module | 1000 mm · 14 m² / cartridge | 1200 mm · 16.8 m² / cartridge | ||
|---|---|---|---|---|---|
| Total area (m²) | Reference airflow (m³/h) at 1.0 m/min | Total area (m²) | Reference airflow (m³/h) at 1.0 m/min | ||
| DHC4 | 4 | 56 | 3,360 | 67.2 | 4,032 |
| DHC6 | 6 | 84 | 5,040 | 100.8 | 6,048 |
| DHC8 | 8 | 112 | 6,720 | 134.4 | 8,064 |
| DHC10 | 10 | 140 | 8,400 | 168 | 10,080 |
| DHC12* | 12 | 168 | 10,080 | 201.6 | 12,096 |
Swipe horizontally to view all reference columns →
* DHC12 is project-specific. DHC4–DHC10 are the preferred standard modular range for export planning; actual packed dimensions must still be checked. DHC12 requires suitable transport arrangements, such as flat-rack shipment where applicable.
Areas shown apply to this 7US polyester cartridge specification. Media characteristics and pleat count, depth and arrangement together determine the effective filter area. Alternative media can be reviewed for specific duties, subject to cartridge dimensions and confirmed effective area.
How to Read the Model Code
DHC6 and DHC10 identify base modules. A complete collector code also includes the total cartridge count and cartridge length code.
After the first hyphen: total count + two-digit length code. In this block, the last two digits identify cartridge length. All preceding digits give the total cartridge count—even for a single module.
Single-module example
DHC6-612
DHC66 cartridges
per base module
per base module
66 cartridges total
= 1 × DHC6 module
= 1 × DHC6 module
121200 mm
cartridge length
cartridge length
Multi-module example
DHC10-5015
DHC1010 cartridges
per base module
per base module
5050 cartridges total
= 5 × DHC10 modules
= 5 × DHC10 modules
151500 mm
cartridge length
cartridge length
Length codes: 10 = 1000 mm · 12 = 1200 mm · 15 = 1500 mm · 66 = 660 mm. Custom-length codes are confirmed for each project; do not infer the length from an unlisted code.
Additional filtration: a suffix follows the main code, for example DHC10-1015-3H for a HEPA configuration, or DHC10-1015-3CH for HEPA + activated carbon. The exact additional filtration specification is confirmed with the project.
Let 7US Review Your Selection
Discuss Your SelectionSend the dust/process details, inlet concentration, required airflow and available height × width × depth. Include temperature, moisture, corrosive components and any explosion-protection requirements where applicable.
06Factory & Project Delivery
From Factory Trial Assembly to Site Installation
Large vertical collectors are prepared as transport-ready modular assemblies before dispatch. The final split between collector modules, hopper / support sections, fan packages and external ductwork is confirmed around transport, lifting access and the site installation plan.
Representative 7US vertical modular collector projects. The images show factory trial assembly, dispatch and field installation across different project configurations. Optional secondary final filtration is selected only where the emission target or return-air requirement calls for it.
01 · FactoryTrial AssemblyModules are checked as complete collector assemblies before dispatch.
02 · DispatchPrepared for TransportEquipment is organized around the shipment and lifting plan.
03 · SiteInstallation & IntegrationCollectors are positioned, connected and completed with the project system.
Ready for Delivery
Trial-assembled modules simplify transport, lifting and site installation.
07Project Inquiry
Plan Your DHC Modular System
Confirm the Configuration Around Your Project
The DHC collector body can be supplied separately or as a package with a fan, motor, electrical controls and selected safety components.
Module arrangement, cartridge length and filter media are selected around the required airflow, dust characteristics and available space. A secondary HEPA stage can be included where emission limits or return-air requirements call for it.
Share existing drawings and duct connections so we can confirm the interfaces and quotation scope. Detailed GA and DWG project drawings can be prepared after the configuration and order requirements are confirmed.
Preparing the public shell…