Free eBook for Subcontractors

Teaspoon
ventilation

Discover 3 powerful ventilation secrets that eliminate horizontal ductwork, slash coordination time, and save tens of thousands — on any basement car park project.

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Trusted by 100+ construction teams across Australia.

$100K+

saved on single projects after SEED fees

2 weeks

to become your client's contractor of choice

13 yrs

of car park CFD + HVAC expertise

What you'll discover

Everything you need to profitably
deliver your next basement car park

Conventional ductwork designs lock subcontractors into coordination nightmares, thin margins, and program delays. This eBook shows you a smarter way — one that consultants consistently can't believe works.

The Teaspoon Technique — no horizontal duct required

Exit Path Focus to eliminate supply air systems entirely

Why conventional carpark design sets subcontractors up to fail

The Coanda Principle for duct-free air distribution

How CFD + HVAC expertise together saves the most money

Using CFD to turn building defects into compliance passes

3 insider secrets

Save time and money in as little as 2 weeks

01

The Teaspoon techniques

Position intakes and exhausts so air stirs the carpark like a teaspoon in a cup. No horizontal duct. Smaller fans. Less coordination. Even small single-level parks can save enough to cover engineering fees twice over.

$25K–$100K+ savings

02 The Coanda Principle

Air clings to surfaces the same way it does in HVAC diffusers. We use the carpark shape itself as an invisible duct — no sheet metal required along the rear wall.

Eliminates duct runs

03 Exit Path Focus

Draw make-up air in through the exit ramp. Delete or downsize the supply air system entirely. The result: 15ppm CO at exit — well below the 60ppm compliance benchmark.

Removes supply system

3 costly mistakes to avoid

Subcontractors lose thousands
to these errors — every single project

01 CFD modelling by a shop with no HVAC experience

CFD is a tool, not expertise. A modeler who doesn't understand sheet metal fabrication or HVAC system costs will miss every profit opportunity. One project ended up with 56 jet fans in series — triggering Fire Brigade delays and massive cost blowout. The fix? Delete the jet fans, apply the Teaspoon Technique.

02 Reducing air volumes below code

The Teaspoon Technique relies on momentum — mass times velocity. Cutting volumes below code turns a simple "duct layout adjustment" Performance Solution into a far more complex compliance issue, and can trigger fire tenability concerns. With EV charging now requiring 3 LPS/sqm, this risk is growing.

03

Extending existing car parks without CFD

Existing duct layouts are often extensive — and free to reuse. But without CFD, you can't know if the existing system handles the extension. In one case, a CFD-guided extension required only one additional jet fan and a 15% fan upgrade. No new ductwork at all.

Insider secrets

Three more gems most modelers don't know

Insider secret 01

Car park engines warm up quickly

CO generation drops from 0.55 g/s at ignition to just 0.06 g/s within 7 minutes. A modeler who accounts for this warm-up curve can significantly reduce required fan sizes, riser dimensions, and energy costs. Inexperienced CFD modelers can't do this.

Insider secret 02

Combine mechanical with natural ventilation

Wind forces exist around buildings 24/7. A project that "nearly" complies with natural ventilation code can often be nudged over the line with minor opening adjustments — eliminating large mechanical systems entirely. In one case, 4 small tunnel fans replaced a full 37,230 LPS mechanical system.

Insider secret 03

Use CFD to resolve building defects

When CFD was the original compliance method, a revised "As Built" model can substitute as the final compliance report — turning a potential defect into a signed-off pass. A fan underperforming due to shaft restrictions? Remodel, relocate two fans, and demonstrate compliance without costly rectification work.

About SEED Engineers

13 Years. 100+ Projects.
Real Results.

SEED Engineers has 13 years of combined CFD and HVAC design experience working directly for subcontractors across Australia. We don't sell equipment. We don't have vested interests. We solve the problems that cost you money and time.

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