AAF滤网培训方案.ppt

1、Better Air Is Our Business,AAF Training Brief,为什么要使用过滤器进行过滤？ 空气过滤器原理 AAF过滤器种类及参数 空气过滤器的测试和标准 安装,操作和维护,Better Air Is Our Business,粗劣的空气过滤的后果,粗劣的空气过滤,粗劣的清洁系统和室 内空气质量,建筑里人们的舒适，健康生活和生产的负作用 SBS (= 病态建筑综合症) 和 BRI (= 建筑疾病),Better Air Is Our Business,建筑综合症 (SBS),伴随急剧不适的症状: -头痛 -注意力不集中 -呼吸困难 -皮疹 -上呼吸道问题 -恶心

2、-疲劳 -视力模糊 -其他 原因不易被发现 离开建筑物可减轻痛苦,Better Air Is Our Business,与建筑物有关的疾病 (BRI),疾病: -退伍军人病 -敏感性肺炎 -过敏性鼻炎 -湿热症 -哮喘 -毒枝菌素中毒 -内毒素中毒 需要立即关注 以临床症状表现 比 SBS更严重: 延长的痊愈时间,Better Air Is Our Business,空气中的无生命和生物微粒污染物影响,灰尘 20%,细菌12%,玻璃纤维 5%,尾气 4%,香烟烟尘 3%,其他 28%,真菌 28%,HBI的一份调查显示真菌和细菌是低劣的IAQ的主要原因 大约70%室内空气质量差的建筑是由空气传

3、播的微粒造成的，可用适当的空气过滤解决 大约40%室内空气质量差的建筑的主要原因是生物微粒（细菌，真菌孢子和他们的副产品）,资料来源: 世界建筑卫生,Better Air Is Our Business,过滤器如何工作？,过滤器携带无生命的微粒和微生物包含微粒 生物稳定剂抑制滤纸上的真菌和细菌的生长 生物稳定剂减少在滤纸上和穿过滤纸的微生物的生长潜力 过滤器的结合面和空气过滤器的生物稳定剂阻止微生物下移到呼吸区域 抗菌剂也能有效对抗一些微生物引发的异味,Better Air Is Our Business,Principles of Air Filtration空气过滤器原理,Physics

4、of Filtration Technology过滤原理,Better Air Is Our Business,Physics of Filtration Technology过滤原理,There are six basic physical phenomena, of which four are applied to common air filter products以下有六种基本的物理过滤原理，其中四种过滤原理在空气过滤器里最常见 Sieving筛分 Inertial separation惯性分离 (viscous) impingement粘贴抗击 Interception捕捉 Dif

5、fusion扩散 Electrostatic charged filtration (active and passive)静电吸附 有：(主动和被动),Better Air Is Our Business,Physics of Filtration Technology过滤器原理,Sieving筛分 Particles are retained as the physical size is larger than the opening of the mesh 尺寸较筛孔大的微粒被留下 Not used in common air filtration, although some ver

6、y large particles may get sieved out of the air 通常不应用于空气过滤器中，尽管一些大的微粒可能被从气体中分拣出来,Better Air Is Our Business,Physics of Filtration Technology过滤原理,气流,引力,沉淀物,Inertial separation惯性分离 Particles are removed from the airflow by gravitational forces由于地球引力的作用，空气中的部分微粒被分离出来 Principle is applicable to (very) l

7、arge particles on which gravitational forces can act 此原理适用于非常大的微粒，可由重力分离 Applied in Cyclones and Dust Louvre inertial separator 应用于旋流收尘器和百叶窗惰性分离器,Better Air Is Our Business,Physics of Filtration Technology过滤原理,(Viscous) Impingement:粘贴并抗击 Principle is based on as many particles as possible colliding

8、(impinging) and sticking to filter media（原理是基于很多微粒尽可能撞击以及粘帖在过滤器上） An efficient adhesive is required to retain heavy particles (viscous adhesive) 需要一种有效的粘合剂来保留重的微粒（较粘的粘合剂） Principle is used in prefilters and is effective for large, heavy particles only（仅适用于早期过滤，而且仅对大、重的微粒有效） Filter media should have

9、as many large fibers as possible to increase particle impingement 过滤介质应该有很多大的纤维，可以用来提高微粒的撞击。 A high air velocity, typically 1.5 to 3.0 m/s, to increase collision/impingement ratio. 高的气流速度，通常1.5到3.0米/秒，可提高撞击比率。,Better Air Is Our Business,Physics of Filtration Technology过滤原理,Viscous Impingement粘贴并抗击,B

10、etter Air Is Our Business,Physics of Filtration Technology过滤原理,Interception捕捉法 Principle is based on intercepting as many particles as possible in fine packed fleece of filtration media 此原理基于在大量微粒中拦截被过滤器介质群集在一起尘絮 A low media velocity, typically 0,1 m/s, is required to achieve effective air filtratio

11、n and to avoid blow-off 低速度，通常0,1 米/秒，需要高效且带有鼓风系统的空气过滤器来完成 The incidence of interception is increasing with particle size until a point is reached where the particle will be re entrained into the air stream 拦截的范围可随着微粒的大小增长，直到达到一个微粒可以被重新输入到气流中的一个临界点。 Principle is used in medium efficiency filters 此原理

12、被应用于中效的过滤器,Better Air Is Our Business,Physics of Filtration Technology过滤原理,Diffusion扩散 Principle is based on very small particles having very little mass and therefore behaving like gas molecules 此原理基于具有非常小密度的非常小的微粒，比如气体分子 Collision with the gas molecules results in randomly moving particles and is

13、known as Brownian movement 随机运动的气体分子相互碰撞的结果，如众所周知的布朗运动 Intercepting as many particles and thus achieving affective air filtration , requires a very low media velocity of typically 0.02 m/s 大部分微粒的拦截是在高效空气过滤器里完成，需要的速度非常小，通常是0.02 米/钞 The molecular forces of attraction, known as Van der Waals force, tha

14、t exist between particles and media, retain the particle on the filter media 分子的扩散力，如凡得瓦尔引力，存在于微粒和介质之间，过滤器会把微粒留住。 Principle is therefore getting more effective, the smaller and lighter the particle is. 此原理更高效，微粒更小、更轻 The principle is used in medium and high efficiency filters 此原理用于中高效过滤器,Better Air

15、Is Our Business,Physics of Filtration Technology过滤原理,Diffusion扩散,Interception 捕捉,Better Air Is Our Business,Physics of Filtration Technology过滤原理,Active electrostatic charged filtration静电吸附 Principle is based on positively charged particles being attracted onto oppositely charged plates 此原理基于带正电荷的微粒与

16、带负电荷的微粒在电场中互相撞击。 Dust particles are held on the plate by viscous adhesive coating 灰尘微粒在电场中被吸附。 On the plates particles agglomerate before being blown into a secondary filter or being washed down 在电场中，微粒在被吹进第二层过滤器中或者被清洗掉前先凝聚。 Principle is effective for all particle sizes and effectiveness depend on a

17、pproach velocity and charge 此原理对所有尺寸的微粒有效，其效用取决于电荷所能达到的速度。 Because of high investment cost and maintenance not very common in general HVAC installations 由于高的成本和维护费用，在通常的暖通设备安装里面并不常用。 Principle is used for large industrial dust collectors (electrostatic precipitators) and small self-contained unitary

18、 collectors for ultra fine sub micron particulates and aerosols such as tobacco smoke, welding fumes and oil mist 此原理用于大型的工业尘埃收集器（电收集器）和小容量的用于更精细的微粒与浮质的收集器 ，比如烟雾， 焊接烟，油烟,Better Air Is Our Business,Physics of Filtration Technology空气过滤器技术原理,Active electrostatic charged filtration主动静电吸附过滤,Better Air Is

19、 Our Business,Physics of Filtration Technology过滤原理,Passive electrostatic charged filtration被动静电吸附过滤,Better Air Is Our Business,Physics of Filtration TechnologyEffective All-round Particle Removal过滤器技术原理多方面有效去除微粒,Involves use of different types of filter包括不同使用类型的过滤器 Coarse filter粗效过滤器viscous impingem

20、ent粘贴抗击 Medium Efficiency filter中效过滤器interception and diffusion拦载和扩散 HEPA filter高效过滤器diffusion扩散,过滤器种类,板式过滤器 褶皱式过滤器 袋式过滤器 箱式过滤器 高效过滤器 自动卷式过滤器,Better Air Is Our Business,板式过滤器:,性能: 合成纤维或玻纤 纸板或自封框架 风速:1.52.5m/s 初阻力:6085pa2.5m/s 终阻力:250pa 分类:ASHRAE Arrestance (70%85%) 应用: 商业或工业领域; 初效预过滤器 选择: 递增式密度滤料; 承

21、受压缩的张力; 框架硬度,Better Air Is Our Business,褶皱过滤器:,性能: 棉/聚酯混合滤纸 硬模切割框架,铁丝网支撑; 风速:1.52.5m/s 初阻力:50-80pa2.5m/s 终阻力:250pa 分类:ASHRAE Dust spot (25%30%) 应用: 商业或工业领域 作为预过滤器防止尘埃积累于暖通空调的盘管、风机和管槽内； 作为预过滤器延长高效过滤器的寿命 选择： 适宜的褶间距； 过滤器的框架硬度； 耐湿度性；,Better Air Is Our Business,袋式过滤器:,性能: 玻纤或人造纤维滤纸 滤袋数量; 风速:1.83.0m/s 初阻力

22、:50-180pa2.5m/s 终阻力:250pa 分类:ASHRAE Dust spot (40%95%) 应用： 商业办公建筑、工业领域 选择： 适宜的滤纸面积； 无切削开口； 适宜的滤袋数量； 框架的坚固性；,Better Air Is Our Business,箱式过滤器:,性能: 玻纤或人造纤维滤纸 坚固的框架,铝箔或热塑性胶分隔板; 风速:2.53m/s 初阻力:100-150pa2.5m/s 终阻力:300pa 分类:ASHRAE 计数法 (60%95%) 应用： 商业或工业领域； 可变风量（VAV）系统； 空间局限处 选择： 适宜的滤纸面积； 过滤器框架的坚固性； 过滤器空所旁

23、通紧密性； 无切削刀口 可燃性/可丢弃性,Better Air Is Our Business,高效过滤器:(HEPA,ULPA),性能: 微细玻纤滤纸 坚固的框架,铝箔或热熔胶分隔物; 风速:1.252.5m/s 初阻力:250pa1.25m/s 终阻力:500600pa 分类:ASHRAE 99.97%0.3um 应用： 半导体、电子工业 医院、医药行业 食品加工业，实验室 选择： 性能的保证； 高质量的材料/工艺； 效能力等级的范围，以适合应用的范围,Better Air Is Our Business,Air Filter Testing for General Ventilation

24、空气过滤器流通空气检测标准,Europe & USA 欧洲 & 美国,Better Air Is Our Business,Filter Testing: Why? 空气过滤器测试:为什么?,Three major concerns in regards to air filters: 空气过滤器的三个主要内容： What will be the efficiency of the filter in removing the airborne contamination (usually dust and in a specific size)? 过滤器怎样才能更有效地去除空气中的污秽（通常

25、是特定大小的尘埃）? How much of this dust will it remove before maintenance is required? 在需要维护以前有多少尘埃被清除？ What resistance will the filter offer to airflow? 过滤器对气流有什么影响？,Better Air Is Our Business,Filter Testing Standards: History? 空气过滤器检测历史标准有哪些?,USA Standards美国标准 亚利桑那州公路灰尘良好Arizona Road Dust Fine 美国采暧，制冷与空调

26、工程师学会ASHRAE 52.1 1992 美国采暧，制冷与空调工程师学会ASHRAE 52.2 1999 American （美国） Society of （社会） Heating, （采暧） Refrigerating and （制冷） Air Conditioning （空气条件） Engineers（工程师）,European Standards欧洲标准 EuroVent 4/5 DIN 24.185 EN-779 1993 EN-779 - 2002,Better Air Is Our Business,Filter Testing Standards: History空气过滤器检测

27、标准: 过去,The test results of the ASHRAE 52.1 - 1992 and the EN-779 1993 could be easily compared, you only needed to watch the test parameters 美国采暧，制冷与空调工程师学会测试结果52.1 - 1992和EN-779 1993不容易比较，不过你可以注意其测试参数。 The ASHRAE 52.2 1999 and the EN-779 2002 are more difficult to compare as the classification syst

28、em is not the same 因为类别不同，所以美国采暧，制冷与空调工程师学会52.2 1999 与 EN-779 2002 很难比较。,Better Air Is Our Business,Filter Testing Standards过滤器检测标准,The standards have evolved to address: 标准改进如下： Indoor air quality and air cleanliness in occupied spaces: Health of occupants versus air cleanliness 内部空气质量和空气清洁度达标的空间：空

29、气清洁度达到健康的标准。 Protection of products during process manufacture 保护制造加工产品 Protection of HVAC equipment 保护暧通系统设备 Standards makes it possible to compare the filters with each other 标准使得过滤器之间可以相互比较,Better Air Is Our Business,Criteria for testing:检测标准: Initial resistance is measured over the clean filter

30、at 25% to 125% of nominal airflow 过滤器的除尘标准初阻力大于25%到125%的名义气流。 Initial color test is measured with atmospheric dust 大气尘埃以颜色为最初的测试标准 The filter will be loaded with ASHREA test dust 过滤器在包装前必须一致经过美国采暧，制冷与空调工程师学会尘埃测试 The color test + loading the filter will be repeated till the final resistance is reache

31、d 颜色测试+反复装载过滤器直到最终阻力达到。 The average grafimetrical efficiency (Arrestance) en the average colorefficiency (Efficiency) will be calculated from initial till final resistance 从初始到结束将在平均颜色效率中计算出平均 测试 效率. The dust holding capacity (DHC) is calculated from the number of dust X average Arrestance 尘埃清除能力在X尘

32、埃平均数量中得出。,ASHRAE 52.1 - 1992 Methodology美国采暧，制冷与空调工程师学会 52.1 - 1992 方法论,Better Air Is Our Business,ASHRAE 52.1 - 1992 Methodology美国采暧，制冷与空调工程师学会 52.1 - 1992方法论,Grafimetrical test碳酸锌测试,Atmospherische test 大气测试,测量压力,气流,过滤器终端,过滤器测试,存尘 瓶,过滤器测试,测量压力,下游对象,上游对象,大气空气,Better Air Is Our Business,ASHRAE 52.1 -

33、 1992 Methodology美国采暧，制冷与空调工程师学会52.1 - 1992 方法论,1,2,3,4,1. Arrestance versus Dust Fed捕捉与尘埃反馈 2. Atm. Dust Spot Efficiency vs. Dust Fed尘埃跟踪与尘埃反馈 3. Resistance versus Dst fed阻力与尘埃反馈 4. Resistance versus Rated Airflow (clean device)阻力与额定气流（自洁设计）,ASHRAE Dust:美国采暧，制冷与空调工程师学会尘埃: 72 % AC fine test dust72%A

34、C良好尘埃测试 23 % Carbon black20%黑烟末 5 % Cotton lint5%尘絮,Better Air Is Our Business,EN779 1993 方法论,First European Standard for General Air Ventilation Filters欧洲最初标准是过滤器的空气流通 ASHRAE test has been used as basis for EN779美国采暧，制冷与空调工程师学会以前测试标准基本是EN779 Repelaces EUROVENT 4/5 and national standards like DIN 24

35、.185废除欧洲4/5与国家相似标准DIN24.185 Filters with initial dust spot efficiency 20% are classified as Efficiency Filters (F5 - F9). 过滤器的最初除尘率20%是当做过滤器分类（F5-F9） Final pressure drop is 450 Pa最终压力下降是450Pa,Better Air Is Our Business,EN779 1993 方法论,Initial efficiency 20%,过滤器类型,粗效过滤器,高效过滤器,EN779分类,初始效率20%,平均（am ）,捕

36、捉率（%）,平均（am ）,除尘效率（%）,最终（Pa ）,Better Air Is Our Business,ASHRAE 52.2 - 1999 Methodology美国采暧，制冷与空调工程师学会52.2 - 1999 方法论,Better Air Is Our Business,EN779 2002 分级,分类,表格1-空气过滤器分类依照EN779,最终下降压力Pa,平均捕捉（Am）综合尘埃%,平均效率（Em）和0，4um色染%,Better Air Is Our Business,MERV versus EN-779 Table最大效率与EN779表格,Better Air Is

37、Our Business,Filter Testing: Test Rig过滤器测试：测试设备,Better Air Is Our Business,Global situation with two standards全球一致有两个标准,Two different standards:不同的标准： One for EUROPE 一个是欧洲 One for USA 一个是美国 Classification system not the same, and difficult to compare分类系统不一样，很难做比较 No life performance in MERV classifi

38、cation最大使用寿命分级 Initiative at ISO TC117 with EN779:2002 as ISO/CD 21220主动在ISO TC117和EN779：2002，ISO/CD21220,Better Air Is Our Business,EN1822,HEPA (High Efficiency Particulate Air Filter) and ULPA (Ultra Low Penetration Air Filters) testing and classification 高效率空气粒子过滤器和超高效空气粒子过滤器的测试与分类 H10-H14 HEPA f

39、ilters, U15-U17 ULPA filters H10-H14 属高效空气粒子过滤器， U15-U17 是超高效空气粒子过滤器 The filter efficiency test on MPPS (Most Penetrating Particle Size) determines the Filter Classification 过滤器效率测试（最易穿透粒径）决定过滤器的分类 Filter Efficiency Test 1.过滤器效率测试 Leak Test with smoke for the HEPA filters or automated test with part

40、icle counter for ULPA filters 2. 针对HEPA过滤器的烟低谷测试或者是针对ULPA 过滤器 2的用微粒测量器的自动测试。,Better Air Is Our Business,Physics of the Test Procedure检验过程和原理,Penetration versus Particle Size 渗透相反的微粒尺寸,99,999999,99,99999,99,9999,99,999,0,01,0,02,0,05,0,1,0,2,0,5,1,0,m,0,000001,0,00001,0,0001,0,001,E,P,1,5 cm/s,3,0 cm

41、/s,MPPS as function of media velocity for the same ULPA glass media MPPS作为同样是ULPA玻璃介质介质速度的功能,Better Air Is Our Business,HEPA & ULPA Classification高效空气粒子过滤器和超高效空气粒子过滤器的分类,Smoke Test for H13 & H14 as Visual Scan accepted H13 和 H14公认视觉与自动扫描烟尘测试,AutoScan vs. Visual Smoke Test烟尘自动扫描，视觉测试,Better Air Is Ou

42、r Business,HEPA & ULPA Classification高效空气粒子过滤器和低效粒子空气过滤器的分类,Overall Efficiency to EN1822 for H12 to H14全部效率EN1822 从 H12 到 H14止,Overall Efficiency with Laser-Spectrometer全部效率用激光-分光计,Better Air Is Our Business,EN1822 Classification EN1822分类,Better Air Is Our Business,Ratings to EN1822EN1822额定,to EN182

43、2,Better Air Is Our Business,Fire Class Certification: UL防火体系证明：UL,UL: Underwriters Laboratories Inc. A filter can be listed in one or two categories: 过滤器能被划分到下列两类中： Class 1 Units体系1 Units集合 Class 2 Units体系2 Units集合,Better Air Is Our Business,Fire Class Certification: UL,Class 1 Units: 体系1 Units: 集合

44、 When clean, these filters do not contribute fuel when attacked by flame and emit only negligible amounts of smoke. The filter shall not produce flame or sparks when subjected to the Flame-Exposure Test. 清洁情况下，当几乎不带烟尘的火焰袭击过滤器，过滤器将不提供燃料；当做火焰爆炸测试时，过滤器不会产生火苗或火星 Class 2 Units:体系 2 Units: 集合 When clean,

45、these filters burn moderately when attacked by flame or emit moderate amounts of smoke, or both. The filter shall not produce flame or extensive (25 or more) sparks which are sustained beyond the discharge end of the test duct when subjected to the flame-exposure test. 清洁情况下，当几乎不带烟尘的火焰或者带烟尘的火焰袭击过滤器，

46、过滤器将适量燃烧。当做火焰爆炸测试时，测试的放电结束后，过滤器将不会产生火焰或额外的(25 或者更多)火星。,Better Air Is Our Business,Fire Class Certification: 防火体系证明,French Fire Class Certification: 法国防火体系证明： This certification only applies to the media, not the filter itself 这个证明是唯一应用于过滤器防火级别的标准。 M1 M2 M3,Better Air Is Our Business,Installation, Op

47、eration and Maintenance Training 安装,操作和维护,Better Air Is Our Business,Installation of Built Up Filter Banks组合式过滤器组的安装,Composed of individual holding frames调整好每个外框 Frames are attached to one another to form a bank to fit the space根据空间的大小将框架相互连接到一起 Frames are attached cia fasteners which are usually po

48、p rivets框架用扣件连接到一起,通常是波普铆钉. Fitler bank is installed inside the plenum of duct section过滤器组安装在导气组件充气部分的内侧. Correct sizing of the cross sectional dimensions of the plenum/duct section is necessary 必须正确测量充气/导气组件的连接尺寸. System has to be properly levelled and plump 系统必须正确水平并充气. Plenum or duct section has

49、to be free of dirt 充气和导气部分必须没有杂质.,Better Air Is Our Business,Built-up Filter Bank组合式过滤器组,Better Air Is Our Business,Fastening Frames Together in Built-Up Filter Bank将框架和组合式过滤器组固定到一起,Filter frames are locked together using blind rivets 用空心铆钉将过滤器框架连接到一起. Holding frames are usually pre punched to insta

50、ll the fasteners 外框通常都为方便连接已经打孔.,Better Air Is Our Business,2至4英寸过滤器外框的连接组合,小的过滤器框可以先在一个平面上放在一起,然后移装到它们的永久安装位置上 大的装置可以分开制造,然后作为小部件组装,最后移到安装位置. 大的过滤器组通常用硬棒在边框两条对边见进行加固. 裂纹和小的缝隙可以被嵌填. 大的开口可以用特制的金属条补好.,Better Air Is Our Business,Assembling Banks of Holding Frames 4 inch Deep外框厚度大于4英寸的组件组装,Assembly and

51、installation usually takes place at the site where the bank is to be installed 组合和安装通常在组件应该被安装的地方进行. Bank is built up row by row 边缘一排排地连到一起. Minor cracks can be caulked 小的裂缝可以被嵌填. Larger openings can be closed by using custom made metal filter pieces 大的开口可以用特制的金属条补好.,Better Air Is Our Business,V-Ban

52、k Filter ArrangementsV形过滤器组的安装,Designed to handle a larger air capacity, typically 2,5 m/s 设计用于高风量,例如2.5m/s The introduction of filters which can handle a higher face capacity eliminated the need for most V-bank arrangements 可以用适合高风量下工作的过滤器替代V形过滤器组 Some filters because of their in-line depth cannot

53、be installed in V-banks 某些过滤器由于嵌入厚度不能在V形组件中安装,Better Air Is Our Business,平展滤料过滤系统,特制的平展形滤料被垂直安装在特殊的固定框架上 滤料必须被很好地安装在固定框架上,以防当HVAC系统打开时滤料松垂. 所用滤料通常是合成纤维或者置于金属框中,以便安装到框架中. 采用合成纤维主要是因为它在安装和移动的过程中不容易被损坏 框架系统通常包括一个周遍密封的设备来支撑滤片并防止侧漏 有时作为其他过滤器组的前置过滤器使用,Better Air Is Our Business,压降测量设备,每个过滤器组必须有它自己的压降测量装置

54、风机的选择,风机的转速,风机的马达,取决于气流量和风机面临的阻力:过滤器组就是阻力之一 随着灰尘在过滤器上堆积,过滤器的压降增大. 当某个时间过滤器的停用压降达到时,就必须对过滤器进行更换了.,Better Air Is Our Business,压降是判断过滤器状态的最好方法,当压降上升时，系统鼓风机需要更大的功率将空气吹过过滤器,这就增加了能耗和成本. 当压降到达某个点,初效和中效过滤器会由于滤料上的灰尘散落,导致过滤效率开始下降. 散落开始的压降是过滤器已经达到它的停用压降并应该更换的信号. 然而,其他机械式过滤器的效率会随着压降继续上升. 压降是决定过滤器是否应该更换的测量指标,因为压

55、降对系统的气流产生影响.,Better Air Is Our Business,First Rule: Pre-Check Filters and Filter Banks第一条:预先检查过滤器和过滤器组,Check Filter Holding Frames检查过滤器固定框 Are they rigid enough?它们是否牢固? Have all fasteners been installed and secured?是否所有的锁扣都已经安装并锁紧. Are all the frame channels clean?所有的框架沟槽已经清洁? Are the gaskets in tac

56、t?垫片是否到位? Are the proper quantity of fasteners and sealing mechanisms installed?是否安装有合适数量的锁扣和密封件? Have all the leaks and cracks between the holding frames and the plenum been caulked or closed? 固定框和实体上的所有漏点和裂缝是否已经被填充和封闭?,Better Air Is Our Business,Filter Fasteners 过滤器锁扣,Better Air Is Our Business,Clean Installation (洁净安装),Better Air Is Our Business,平板过滤器的安装,安装前检查过滤器尺寸是否适合固定框 参考边框或标签上的方向箭头,将过滤器安装到它们的固定框中 过滤器上的方向箭头表示系统的气流方向 打开所有的固定件 将过滤器装入框中,并关闭锁扣将其固定,Better Air Is Our Business,Inst