Steve, Thank you for your detailed email and for proactively seeking
clarification on the HVAC requirements for our new lithium battery pack
assembly facility. Your summary of the situation is accurate, and we
appreciate the opportunity to align on the design basis before proceeding.
After an internal review and consideration of our specific process needs,
we can confirm that our intent is for a comfort-conditioned industrial
space with specific humidity control, rather than a full ISO-8 cleanroom
environment. The mention of "ISO-8" in the kickoff meeting was intended to
convey a general need for a clean and controlled environment but was not
meant to be a formal classification requirement.
To directly address your questions:
1.Is ISO-8 a firm requirement? No, it is not. An ISO-8 classification is
not necessary for our battery pack assembly process. We believe that an ISO-9
classification (or even a well-maintained, unclassified space) with good
housekeeping and filtration practices will be more than sufficient for our
needs. Our primary concern is controlling airborne particulates that could
affect final product quality, not meeting a specific cleanroom standard.
2.Is humidity <50% mandatory? Yes, this is a mandatory requirement for our
equipment and process. Maintaining a relative humidity of less than 50% is
critical to prevent moisture absorption and ensure the quality and safety
of our battery packs. However, we do not require the extremely low dew
points (-35°C or lower) associated with lithium-ion cell manufacturing. Our
process involves the assembly of pre-sealed cells, which is a far less
moisture-sensitive operation.
3.Will future products require tighter control? We do not anticipate any
future products or process changes that would require significantly lower
humidity or higher filtration levels. Our long-term forecast is based on
the assembly of similar battery pack architectures.
4.Is positive pressure required? No, positive pressure relative to adjacent
spaces is not required. A neutral or even slightly negative pressure
environment would be acceptable, as long as the primary production space is
well-sealed and the HVAC system can effectively maintain the required
temperature and humidity levels.
Based on this, we agree that the project scope should align with your
description of a comfort-conditioned industrial space with robust
dehumidification, rather than a full cleanroom approach. This will allow us
to achieve our operational goals without the unnecessary cost and
complexity of an ISO-8 buildout.
We are happy to schedule a brief follow-up meeting to confirm these details
and answer any further questions you may have. Please let us know what time
works best for your team.
Thank you again for your diligence and partnership.


<https://lithiumbatterycompany.com/>
<https://www.instagram.com/lithiumbatteryco/>
<https://www.linkedin.com/company/the-lithium-battery-company>
<https://www.facebook.com/LithiumBatteryCompany/>
<https://www.youtube.com/c/LithiumBatteryCompany>
<https://lithiumbatterycompany.com/>
NATHAN A. STARON
Founder / CEO
Lithium Battery Company
Cell Phone 813-504-0074
Phone 844-GET-LITHIUM
Nathan@lithiumbatterycompany.com
Schedule A Zoom <https://scheduler.zoom.us/nathan-staron/lithiumbatteryco>



On Tue, Nov 25, 2025 at 3:51 PM Steve Barthlow <
Steve.Barthlow@lddblueline.com> wrote:

> Nathan, Jordan, and Jarrett,
>
>
>
> Please see email below from Hahn Engineering regarding potential HVAC
> requirements at the 3900 Coachman building.
>
>
>
> Thanks,
>
>
>
> *Steven D. Barthlow, AIA, NCARB*
>
> principal | vice president | regional director
>
>
>
> *LDD**Blueline**TM*
>
> Discover | Design | Deliver
>
> We're hiring! We're looking for a Project Manager and a Project Architect.
> Send your resume to careers@lddblueline.com
>
> 306 East Oak Avenue, Tampa, FL 33602
>
> *Steve.Barthlow@LDDBlueline.com*
>
> AR 103560 | office 813.771.2378 | cell 404.245.0451
>
>
>
> *From:* Jeffrey Hahn <jjhahn@hahneng.com>
> *Sent:* Tuesday, November 25, 2025 3:44 PM
> *To:* Steve Barthlow <Steve.Barthlow@lddblueline.com>; James Jacobik <
> James.Jacobik@lddblueline.com>
> *Cc:* Stephen Morris <sjmorris@hahneng.com>; William Augensen <
> waugensen@hahneng.com>; Justin Erman <jerman@hahneng.com>
> *Subject:* Lithium Battery Company @ 3900 W Coachman [25029-Email]
>
>
>
> Steve,
>
>
>
> Over the past few days been reviewing the production space requirements
> and the information provided. We originally asked whether any specialized
> HVAC conditions—such as positive pressurization, controlled filtration, or
> humidity limits—were required for the production area or the building as a
> whole. The response we received at that time was that no positively
> pressurized spaces and no specific direction on cooling and humidity
> requirements.
>
>
>
> Last week during the kickoff meeting it was mentioned that ISO-8
> conditions for the production space, with a target of humidity below 50%,
> are desired. This represents a significantly higher level of HVAC
> sophistication than standard comfort cooling, as it introduces
> air-change-rate requirements, filtration requirements (HEPA or near-HEPA),
> positive or neutral pressure considerations, and much more precise humidity
> and dew-point control. These items directly affect airflow quantities,
> equipment selection, duct routing, ceiling/architectural details,
> and—importantly—electrical capacity.
>
>
>
> Before we proceed with finalizing our basis of design, we want to confirm
> the actual intent of the owner and equipment team. Several indicators
> suggest that the production line may be low shedding and relatively
> enclosed, and they indicated that similar equipment in other facilities
> overseas often operates in minimally conditioned spaces. If the true
> requirement is to simply temper the space—cooling, dehumidifying to a
> comfortable level, and preventing condensation—then the system can be much
> simpler and far less costly. However, if the intent is to meet ISO-8
> cleanliness, maintain <50% RH, or anticipate future products that require
> tighter environmental control, then we need to design the space accordingly
> from the start to avoid rework or service interruptions later.
>
>
>
> At this point, the HVAC project could fall into one of two very different
> scopes:
>
>    1. A full ISO-8 environmental cleanroom approach, with defined air
>    changes per hour, filtration, and controlled humidity; or
>    2. A comfort-conditioned industrial space, with no pressurization and
>    only general cooling and dehumidification.
>
> Each path has different implications for HVAC equipment size, system
> complexity, construction coordination, and electrical infrastructure.
>
>
>
> We respectfully request a clarification meeting to confirm:
>
>    - Whether ISO-8 is a firm requirement or an aspirational target,
>    - Whether humidity <50% is mandatory or optional for initial
>    operations (sounds mandatory based on a reference to equipment operational
>    requirements discussed in the meeting)
>    - Whether future products or process steps may require lower humidity
>    or higher filtration, and
>    - Whether positive pressure relative to adjacent spaces is required.
>
> Once these items are confirmed, we can move forward with confidence that
> the system matches the owner’s true operational needs.
>
> Thank you,
>
> Jeff
>
>
>
>
>
> *Jeffrey J. Hahn, P.E.*
>
> *President*
>
> jjhahn@hahneng.com
>
> Direct: 813.537.2162
>
> Office: 813.831.8599
>
> *Hahn Engineering, Inc.*
>
> 3060 S. Dale Mabry Hwy.
>
> Tampa, FL 33629
>
> <https://www.hahneng.com/>
>
>
>
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