The FLAIRMO N2G‑DS4000 delivers nitrogen at 99.5% purity in a 0.23 m² footprint – eliminating the corrosion that compressed air causes inside fire sprinkler pipework.
The N2G-DS4000 is a nitrogen generator built specifically for dry pipe and pre-action sprinkler systems. Compressor, dryer, PSA nitrogen generation and automatic venting are combined in one cabinet, designed and manufactured in Denmark. We size the solution based on the pipe volume and number of zones in your installation, from a single riser to a car park with six sections.
With a footprint below 0.23 m², the N2G-DS4000 delivers continuous nitrogen supply at 99.5% purity, exceeding the industry standard at 98%. Every feature is designed to keep your fire protection system stable and corrosion-free – without any intervention during daily operation.
Pressurizes empty pipework rapidly using compressed air, then automatically switches to nitrogen mode and refills with nitrogen whenever pressure drops.
Automatically transitions to high-purity nitrogen mode (99.5% N₂) once target pressure is reached, ensuring continuous corrosion protection after any pressure event.
Integrated sensors track pressure every minute and perform automated AUTO-VENT O₂ checks every 6 hours across up to 6 individual risers - alerting before issues develop.
Built-in Modbus TCP/IP protocol and VNC Ethernet interface allow remote access to live operational data, trend graphs, and controls without on-site visits.
All-in-one cabinet fits into just 0.23 m² with no dedicated compressor room or special ventilation required - ideal for data centers, car parks, and storage facilities.
Features an integrated, self-regenerating adsorption dryer and 0.01 µm filtration to eliminate oil and moisture risk, requiring only simple annual service .
Facilities that rely on dry pipe or pre-action sprinkler systems face a common challenge: compressed air carries oxygen and moisture into the pipework, causing internal corrosion over time. Rust builds up on the pipe walls, narrowing the internal bore and increasing friction loss. To compensate for future pipe restrictions, hydraulic calculations for air-filled systems use a lower Hazen-Williams C-factor (C=100), forcing designers to specify larger pipe sizes. For critical infrastructure like data centers, car parks, cold storage, and commercial buildings, this means higher material and installation costs - and a system whose performance still declines as the pipes age. Nitrogen changes that equation completely. When nitrogen purity is maintained at 98% or higher, NFPA 13 allows a higher C-factor of C=120, acknowledging that pipes remain smooth and free of internal rust.
FLAIRMO’s N2G-DS4000 makes these benefits a reality in a compact 0.23 m² footprint. Delivering 99.5% nitrogen purity via automated multi-zone venting, it eliminates corrosion at the source. This allows engineers to design with smaller pipe volumes, switch to cost-effective black steel, and ensure the system maintains its design performance for decades.
In a data centre, a sprinkler leak is not a minor maintenance issue. Corrosion in air-filled pipework causes pinhole leaks, and in a dry pipe system a steady loss of pressure can trip the valve and fill the pipes with water. The result can be equipment damage, downtime and an expensive recovery.
FLAIRMO nitrogen generators replace compressed air with dry nitrogen at 99.5% purity, minimising the oxygen and moisture that drive corrosion. In new builds, nitrogen also allows a higher C-factor in the hydraulic design – a real saving at data centre scale. Our systems already protect data centre installations in Denmark.
The N2G-DS4000 connects to your building management system via Modbus TCP/IP, so pressure and purity data appear alongside the rest of your facility monitoring.
Planning a new data centre or upgrading an existing sprinkler system? Contact us today or download the N2G-DS4000 brochure.
Oxygen and moisture are the two main drivers of internal corrosion in dry pipe and pre-action systems. The N2G-DS4000 replaces compressed air with dry nitrogen, monitors pressure and oxygen levels in each zone, and automatically vents oxygen-rich air until the target purity is reached throughout the pipework.
Less corrosion means fewer leak repairs, fewer unplanned pipe replacements and a system that keeps its design performance over time. The generator itself needs only a simple annual service.
Above the 98% level referenced in NFPA 13.
Oxygen checks and automatic venting in each zone.
Permitted for nitrogen-filled black steel pipe, vs. 100 on air.
Applications
Dry-pipe and pre-action sprinkler systems are installed where pipework can freeze or where accidental water discharge would damage equipment or stock. In these systems, compressed air brings moisture and oxygen into the pipework. The N2G-DS4000 supplies 99.5% nitrogen as the supervisory gas instead, which reduces internal corrosion and the leaks and pressure loss that follow from it.
Water above live racks is a risk in itself. Doubleinterlock pre-action keeps pipework dry until detection and an activated head signal a fire.
Car parks are often open to outside air, and pipes risk freezing in winter. Dry sprinkler systems keep the pipework empty until the system is activat.
Without heating, pipes risk freezing due to the cold temperatures. Dry sprinkler systems is the only option for this type of storage..
Production halls and warehouses with unheated sections, where dry-pipe networks run long distances and repairs interrupt operations.
Loading docks, canopies, attics and other unheated areas served by dry-pipe systems in otherwise heated buildings.
Reference
The N2G-DS4000 is in operation in data centre installations in Denmark, delivered with Danish sprinkler contractors. Ask us about the reference projects.
Installation example
The installation shown is a dry sprinkler system in a Danish car park. With a footprint of 0.23 m², the N2G-DS4000 is placed in the sprinkler room alongside the valve stations.
The integrated compressor is oil-free, so no oil reaches the carbon molecular sieve that separates the nitrogen from the air. Maintenance is a simple annual service.
Each zone has its own O₂ measurement and automatic venting (AUTO-VENT). In a multi-storey car park, this could be one zone per floor, all supplied from a single N2G-DS4000.
Working with Flairmo
We design and manufacture nitrogen generators in Denmark and work directly with sprinkler contractors on each installation.
The sprinkler contractor provides the pipe volume and the required supervisory pressure. We use those figures to configure the N2G-DS4000 for that specific dry sprinkler system.
We build the electronics, tank, valves and hoses ourselves, using components from long-term supplier agreements. The adsorption towers are designed to last 10+ years with a simple annual service.
Annual service kits, spare parts and remote access via VNC (Virtual Network Computing), so you can review system data without a site visit.
Our position
A nitrogen generator should match the system it supplies, so we do not quote a standard unit. Before we quote, we go through the system data with you and confirm what the N2G-DS4000 will deliver.
Send us the pipe volume and supervisory pressure of the system, and we will come back with a configuration and a quotation. If the project is still at the design stage, we can share the technical documentation you need for the specification..
Last updated: October 18, 2021
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Last updated: October 18, 2021
1.1. Buyer’s acceptance of the offer from FLAIRMO ApS shall also mean acceptance of the General Conditions of Sale and Delivery set out below, which shall apply to the extent they are not deviating from any agreement in writing between the parties.
2.1. Information relating to technical specifications and prices indicated in manuals, leaflets, circulars, advertisements etc. are indicated as guidelines.
2.2. FLAIRMO ApS reserves the copyright and property of drawings, technical information, etc. submitted in connection with offers/contracts,
and of patents, trademarks, name of products, referring to the products sold FLAIRMO ApS.
2.3. FLAIRMO ApS reserves the right to modify the construction and technical specifications without notice.
3.1. In case inspection, and/or tests are required, these will be carried out at the plant in Aalborg, and the costs for such inspection shall be borne by the buyer.
3.2. In case approvals – other than those already carried out by FLAIRMO ApS – are required, the buyer shall give all necessary information and assistance, and he shall bear the corresponding costs.
4.1. The time indicated for delivery is the date at which the product are shipped from the plant in Aalborg. In case of delay, due to reasons other than those mentioned under Article 8 “Reliefs”, FLAIRMO ApS shall forthwith inform the buyer, and state the new date of dispatch, without this giving the buyer right to compensation or to cancel the contract.
4.2. In case the buyer anticipates that he will be unable to accept the delivery of the products, he shall forthwith inform FLAIRMO ApS, stating a new date for the delivery. In case the buyer fails to accept the delivery for reasons other than those mentioned under Article 8 “Reliefs”, FLAIRMO ApS shall be entitled to compensation for the loss suffered by reason of the buyer’s default.
4.3. Terms of delivery are Ex-works (EXW)
4.4. The risk shall pass in accordance with the International Rules for Interpretation of Trade Terms (INCOTERMS) in force at the date of formation of the contract. In case of EXW delivery, the risk will pass not later than when the products are handed over to the first carrier.
5.1. The payment shall be made according to the terms agreed between the parties. Where it is agreed that any part of the purchase shall fall due for payment only after the delivery, the buyer shall take out the usual transport insurance in respect of the products sold, for full value, and maintain such policy in force until payment has been made in full.
5.2. The goods shall remain the property of FLAIRMO ApS until payment has been made in full. In the case of delayed payment by the buyer, FLAIRMO ApS is entitled to charge interest for default, at a rate of 9 percentage points above official rate of discount of the Denmark’s National Bank.
5.3. In the event that after entering the contract, or after issuing the price list, custom export/import duties or other additional charges or costs directly caused by Government measures taken in Denmark or abroad, are imposed on raw materials, machinery components, etc. required for the performance of the contract – or in case collective bargaining results in increases in wages for instance, the buyer shall be liable to pay such increase over and above the price agreed.
5.4. Where the purchase price is agreed in a currency other than EURO, FLAIRMO ApS shall be entitled to adjustment of the purchase price in the event of any alteration to the rate of exchange of the agreed currency relative to EURO.
6.1. FLAIRMO ApS shall not be liable for any damage to property caused by the products after they have been delivered and whilst they are in the possession of the buyer. Nor shall FLAIRMO ApS be liable for any damage to products manufactured by the buyer, or to products of which the FLAIRMO products form a part.
6.2. If FLAIRMO ApS incurs liability towards any third party for such damage to property as described under 6.1. the buyer shall indemnify, defend and hold FLAIRMO ApS harmless.
6.3. FLAIRMO ApS and the buyer shall be mutually obliged to let themselves be summoned to the Court of Aalborg, Denmark examining claims for such damages.
6.4. The limitation of FLAIRMO ApS’s liability in 6.1. above shall not apply where FLAIRMO ApS has been guilty of gross negligence.
6.5. Save as elsewhere stated in these conditions, there shall be no liability for either party towards the other party for loss of production, loss of profit, loss of use, loss of contracts or for any consequential, economic or indirect loss whatsoever.
7.1. Provided that the operational instructions have been carried out, and unless otherwise agreed, the duration of the guarantee is the period stipulated for each type of products, calculated from the date of shipment from the plant in Denmark. The guarantee applies to any faulty material or workmanship in new material.
7.2. Any guarantee claim will only be accepted if the claim is given in writing according to the procedure set up by the Quality Control Department of FLAIRMO ApS.
7.3. Normal wear and tear or deterioration shall not be termed as “defect”.
7.4. Modifications carried out by the buyer, without prior agreement in writing from FLAIRMO ApS, damages caused by violence, misuse, lack of repair and maintenance, incorrect repairs or use of unoriginal spare parts/oil, are not covered by the guarantee.
7.5. Costs of transportation of parts/equipment, travelling expenses/wages of the buyer´s technicians, are not covered by the guarantee.
7.6. On receipt of the claim, FLAIRMO ApS shall forthwith send replacement or repaired parts/equipments.
7.7. In case the replacement parts/equipment are shipped prior to the returning of the defective parts/equipment to FLAIRMO ApS, these will be invoiced – and credited in case the claim is accepted under the guarantee.
7.8. In case the defective parts/equipment are returned to FLAIRMO ApS prior to the replacement/repair, these parts/equipment shall be repaired or replaced, and returned to the buyer, free of charge (except 7.5. above) in case the claim is accepted under the guarantee.
8.1. Industrial disputes, fire, mobilisation, requisition, embargo, currency restrictions, insurrection, strike, lock-out, shortage of transport, general shortage of materials, restrictions in the use of power or other circumstances which are beyond the control of the parties, shall be considered as cases of relief, in case they intervene after the formation of the contract, and impede its performance.
8.2. The party wishing to claim relief by reason of any of the mentioned circumstances, shall notify the other party in writing without delay, on the intervention and on the cessation thereof. The right of suspension of the contract shall only apply in case the effect of above reliefs could not have been foreseen at the time of the formation of the contract.
8.3. If Force Majeure prevents the buyer from fulfilling his obligations, he shall compensate FLAIRMO ApS for expenses incurred in securing and protecting the products.
8.4. In case the performance of the contract is suspended more than six months due to the conditions named under 8.1. above, either party shall be entitled to terminate the contract by notice in writing to the other party.
9.1. The Danish Law shall govern any question that might arise in connection with the business between FLAIRMO ApS and the buyer.
9.2. Danish Law shall determine any conflict. The court in Aalborg, Denmark shall settle any dispute.
If you have any questions about Terms & Conditions, You can contact us:
By email: info@flairmo.dk
By phone number: +45 53 71 72 20
